The Lexington Computer and Technology Group (LCTG) is a volunteer, no-cost, not-for-profit, just-for-fun-and-education organization that meets most Wednesdays from 10am to 11:30am to discuss a wide variety of technical issues. (Sometimes we meet at a different time, see this in the schedule below.) Meetings are open to anyone interested in the topic(s). The group has an email list (see how to join below) for announcements and discussions.
The LCTG grew out of “The Computer Group” which existed prior to the opening of the Lexington Community Center, which is where we meet now.
Members of the group come from all walks of life, education, and previous experiences. Talks are presented by members of the group as well as outside experts on a variety topics of interest to the group. There is a schedule for future talks as well as a record of previous talks, below.
Many of the meetings feature an outside expert; others are led by group members.
Time is set aside, approximately once a month, for short talks and for members to bring
questions or problems to the membership. If you could present a topic of interest to the group, please contact us at
Members can be active, attending most of the meetings, or contributing to the discussion list, or can merely take advantage of the material being posted regarding our talks. There is no requirement for living in Lexington, and although the group started in the Lexington Senior Center there is no requirement to be a senior. The technical level of the talks varies considerably, making much of the material of interest to those with more modest technical abilities.
For further information contact group lead John Rudy at
info@LCTG.toku.us (goes to John and others),
email@example.com (John only), or call John at 781-861-0402. We look forward to have you join us!
To receive notices of upcoming meetings and join discussions, send an email to
LCTGfirstname.lastname@example.org and include in the body of your email:
To send a message to the list, address your email to:
To see information about and using the new list, click here
Given the current Covid-19 situation, presentations are being held online, weekly, on Wednesdays at 10am. See info on upcoming meetings below.
While we anticipate returning to the Lexington Community Center for our meetings sometime in the future, for obvious reasons we cannot predict when this will happen. The online format is working however. If you would like to join the meeting, you will need to join the group (see above) to get emails with the meeting connection information. For security reasons we cannot post this here on this site so either contact a member or join the group – it's free and painless.
See files from presentations year 2018 and earlier. More recent presentation files are included on this page, below.
See Yahoo group messages in raw form from 2010 to October 2019 If you want to help put these in a more readable and useful form, please let SteveI know! Thanks.
"Where to find it" Links to useful websites contributed by group members.
LCTG-Potential Topics and Speakers being considered.
We have stopped using Yahoo Groups, but the message archive prior to October 28, 2019 is currently available at the Yahoo group home page. It's possible this is no longer available; we may put this information up on a new place if there is a demand for this. (Please let SteveI or JohnR know.)
Click here to add your suggestions for talks/speakers/topics
Learn about being a volunteer Moderator – a work in progress. If you'd like to be a Moderator, it's not a difficult job and you'll help the group by volunteering, please let Steve Isenberg or John Rudy know.
Presenting to the group with Zoomnot ready for prime time: [using ppt impress etc to present|Tips for using MS Powerpoint and LibreOffice Impress in your presentation]
This schedule last modified 2021.06.10 20:43
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|June 16, 2021||The Buzz on Bees The biology, pollination, diseases and parasites, killer bees, and beekeeping. (Howard Cohen) |
Join us, and bring your honey!
|June 23, 2021||* Iron Mountain: History. (Carl Lazarus; 45mins +/-) |
* Stan Rose says I could probably be convinced to talk about my experiences on 9/11, although I must admit the technical details of how we recovered are beginning to fade (it is nearly 20 years). I could combine what I do remember with my personal experiences that day and ongoing days. I also have lots of pictures of what happened to our office and the surrounding area. Since this year is the 20th anniversary, maybe this talk should be scheduled closer to this coming 9/11.
|June 30, 2021||Dentistry (David Brother). Topics being considered: Dramatic changes that have occurred in dentristy in the past 50 years. Or dental radio graphic imaging and what it can do especially in regard to dental implants. Or History and development of dental implants. Or thehistory and development in the field of orthodontics and prostetic advances. Or Sixty years of Fluoride: what this has meant to our teeth and health. (Exact topic will be one of these, or maybe something else!).||yes|
|July 7, 2021||Pluto Strikes Back! (After all of the suffering Pluto has suffered by the not-a-planet bullying by the International Astronomical Union, we will mount a degree of support for this picked-on planet or non-planet.). Speaker Scott Kenyon will talk about his recent work on the formation of Pluto and its small satellite system. Learn how Pluto came to be a binary planet and how its four tiny satellites grew out of the debris from a major collision.||yes|
|July 14, 2021||Cancer Therapy and the Scientific Process. The Discovery of the Platinum-Based Compound Used in Cancer Chemotherapy: An Example of the Scientific Process (Dick Wagner)||yes|
|July 21, 2021||Potpourri|
|July 28, 2021||CERN and the Hadron Collider. History, Why It Was Built, Hoped Outcomes, Discovery of Bison, What is Next (Harvey Newman, professor Cal Tech). Harvey will introduce the status and outlook for the LHC, its past and present and near term outlook, and provide a panorama of the future including some of the leading programs. Harvey Newmnan. (John Rudy)|
|Aug 4, 2021||Seager exoplanet presentation (presented via Cary Liby and hosted by GeorgeBurnell) https://www.youtube.com/watch?v=Ye-UNXeMJC8. (1h5m)|
|Aug 11, 2021||Retrospective on election security, allegations, concerns, why is it so hard to have a closed and secure system? Securing mail-in voting; how states got it to happen. Involve Town clerk or rep to participate? (George Burnell)||George Burnell|
|Aug 18, 2021||Potpourri|
|Aug 25, 2021||Archeology Jeffrey Rose (archeologist) in Israel||(Stan Rose) John Rudy|
|Sept 1, 2021||Freakonomics Best of Freakonomics an interview with Steven Levitt and Stephen Dubner, moderated by Faith Salie. Recorded at the 92nd Street Y on May 2015. (Peter Albin has link to 70min video)||yes|
|Sept 8, 2021||(RH day 2)|
|Sept 15, 2021||Potpourri (YK eve)|
|Sept 22, 2021||Dick Wagner CRISPR|
|Sept 29, 2021|
|Oct 6, 2021||Nearly codeless programming (AKA “No Code Programming”); the concepts that are done for you by the system Harry|
|Oct 13, 2021|
|Oct 20, 2021|
|Oct 27, 2021|
|Nov 3, 2021|
|Nov 10, 2021|
|Nov 17, 2021|
|Nov 24, 2021||Day before Thanksgiving|
|Dec 1, 2021|
|Dec 8, 2021|
|Dec 15, 2021|
|Dec 22, 2021|
|Dec 29, 2021||(Meeting rescheduled from April 1) |
* Newest Time Travel technologies. Can we just travel forward in time, or can we go back and forward in time? A how-to with practical demonstrations.
* Instantaneous Travel. (Another way to save time.) How to go from place A to place B immediately. Now you can have Breakfast in Brussels, Lunch in Las Vegas, Supper in Sydney. (If pandemic allows, we could go to a beerfest at the Hofbrauhaus in Munich for an early dinner; reservations would be required.)
* Ice Cold Fusion. Keep your drinks cold as you generate enough power to supply your house–drop off the power grid, as you sip.
* Levitation: Usage and Practical Considerations. Getting up in the world easily. Having trouble climbing stairs? No longer.
* Applying Lucid Dreaming techniques. If you don't like the way things are, you can change the past, present, and future with a dream. (see: The Lathe of Heaven by Ursula K. LeGuin, guy finds out that his dreams can alter reality.)
* Portable miniaturized HVAC. Heating and air conditioning in your pocket, stay warm on the coldest days, stay cool on the hottest days. Be the envy of your friends. How to build your own portable HVAC using materials around your house and some Thorium you can buy at the drug store.
We are seeking speakers for the topics, let us know if you can speak on any or if you know someone who can.
Note that we may not have enough time for all of these topics…then again, if we use the first one, we might.
visits: 30/42/12493 since 20210323
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|Date||Topic and links||Attaches||#|
|Jan 6, 2021||Dr. Peter Braun: A Covid-19 Primer A scientific look at the virus. Why is COVID-19 so “successful” from a pathogenic point of view. Where do viruses like this come from? How has treatment progressed? Vaccine development and technology. (The recording contains a follow-up on the Brevig Mission that was not covered in the live presentation; at approx. 1:37).||watch the presentation||53|
|Jan 13, 2021||Priestly and the Discovery of Oxygen (presented by Jerry Slate, M.D.) Joseph Priestly (1733 - 1804) is credited with the discovery of oxygen. His discovery was a part of a long term scientific effort to understand the nature of matter. His work as an untrained scientist showed analytical skill which illustrated the relevance of his finding. His discovery of oxygen represents the beginning of the understanding of the composition of the atmosphere and its role in respiration.||watch the presentation||42|
|Jan 20, 2021||Quantum Biology (GeorgeG) (video and intro) with discussion |
When Quantum Mechanics were first introduced widely, pioneers such as Heisenberg thought that quantum effects should play a role in biology, but for the next 50 years it was sort of forgotten. With today's computing power and instrumentation new insights are being given to explain biological phenomena by invoking quantum effects such as tunneling or entanglement. We will hear 3 experts (MIT, UC Irvine, & U Arizona) discussing the implications of quantum effects in biological entities
Video we watched:Quantum Biology: The Hidden Nature of Nature (1h35m) Other related and referenced videos:
Part 1: How Plants use Quantum Mechanics (12m) . Part 2: Enzymes, the Engines of Life (12m) . Part 3: How Birds (Might) Navigate with Quantum Mechanics (21m)
|George's introduction |
|Jan 27, 2021||Potpourri Peter Albin, your host |
Y2K (John Rudy, 20min)
Drones in the UK, how they threaten aircraft safety, measures taken to address them. (The video is not widely available)
|Feb 3, 2021||Plastics having a recycle number on them leads people to think they will be recycled and are perhaps more accepting of then using them. However, many thin plastic containers such as salad boxes or clear takeout containers are not in practice recycled. (George Burnell) This might be more than one session. Plastic bags biodegradability, manufacture, disposal, recycling. |
also possibly of interest: https://www.pbs.org/newshour/show/the-plastic-problem (1hr video)
Recycling by the numbers
|Watch the presentation slides||35|
|Feb 10, 2021||Polaroid: Recently I learned about a Google talk on the history of Polaroid (Instant:The Story of Polaroid Christopher Bonanos Talks at Google, 2012). It might make an interesting meeting. The talk is about an hour and we could augment it with “actual folks” who worked for Polaroid? With 3-4 people worked there (Peter Albin) |
I worked in photographic film product development at Polaroid for 23 years (1976 to 1998). It was there that out of necessity I became in involved in N-dimensional non-linear systems optimization computer tools. I could discuss the approaches that we used and the evolution of the software tools that were internally developed. Many of these tools and graphical visualization aids are now available in the commercial pack Design Expert by StatEase which I used in a final consulting gig at Polaroid in 2003. [Bob Eckert]
|[presentation coming soon]||36|
|Feb 17, 2021||History relating to Rubber, what used for, how manufactured, WWI, WWII, rubber shortages (George Burnell) |
WWI WWII Japan taking over, fire hoses & rain gear
|Watch the presentation||33|
|Feb 24, 2021||(GeorgeG) Mars landing, Perseverance landed 2/18/2021, George discusses this with several visuals||Watch the presentation |
Mars photos to music
|Mar 3, 2021||Potpourri |
* Peter Mui and fixing your machine
Peter Mui's Free Fixit Clinic Participant Registration: http://bit.ly/fixitcheckin
* Rober vid: 15 minutes of useless science facts
|Watch Peter Mui's presentation||48|
|Mar 10, 2021||Rubber Part 2 George Burnell presents the second part of his talk on Rubber: industrial products, recycling, synthetic, and more.||watch the presentation||29|
|Mar 17, 2021||Why is Venus so bloody hot? The greenhouse effect. (Charlie Holbrow)||Watch the presentation||39|
|Mar 24, 2021||I. I. Rabi, a story of scientific rags-to-riches (Dan Kleppner) |
Rabi played a principal role in the transition of U. S. Physics from a backwater position to the international leader in the 1940’s and 50’s. He was awarded the Nobel Prize for his own work, mentored eight laureates at Columbia University, triggered the founding of Brookhaven National Laboratory and CERN, and created the position of Science Advisor to the President. He invented the atomic clock, played a major role in the creation of the theory of relativistic quantum electrodynamics (QED) and mentored the inventors of nuclear magnetic resonance, the maser and the laser.
|Watch the presentation||36|
|Mar 31, 2021||Flying Cars presented by Bill Passman. An overview of what is currently called “Flying Cars”, which includes Terrafugia's “roadable aircraft”, designed to drive from home to an airport and then fly like a General Aviation Light-Sport Aircraft (LSA). Other flying car efforts are aimed at VTOL air taxi fleets, personal VTOL vehicles, electric airplanes and autonomous cargo-VTOLs. |
Technologies being used are folding wings, tilt-wings, tilt-rotors, tail-sitters, and power sources using battery electric drive, hybrid-electric drive, hydrogen, and fuel-cell power.
Bill will also present market hurdles, such as: battery technology, charging infrastructure, safety, heliport infrastructure, noise reduction, and FAA regulatory capabilities.
|Watch the presentation||40|
|Apr 7, 2021||Venus 'n greenh'se — and Mars and Earth (Charles Holbrow) |
What I learned from my Climate Science Study Group (Jerry Slate, Carl Lazarus, Mike Alexander)
|Watch the presentations||37|
|Apr 14, 2021||The Apollo Mission Presented by Fred Martin, ScD.; Dr. Martin served as the Apollo Software Project Manager while at the MIT Instrumentation Laboratory (now Draper Lab) and then pursued an industrial career in software analysis and management. |
History will surely record the voyage to the moon as being the greatest adventure of the 20th century. We will first examine our fascination with our closest neighbor and early speculation of travel through the writings of Jules Verne. We will discuss the principles of how a rocket works, gain an understanding of JFK’s decision and confidence to place a man on the Moon, and experience the Apollo Moon Project “first hand:” its methods, triumphs and surprises. Our resources will include Dr. Martin’s experiences within the Apollo Program and videos of the exciting minute-by-minute landing on the Moon’s surface.
|Watch the presentation||57|
|Apr 21, 2021||> Black Holes by Andrea Ghez (2020 Nobel Prize winner in Physics). link; 50min Presented at the World Science Festival |
> About the Suez Stuck Ship link; 8min
|Apr 28, 2021||> Cacelia Payne-Gaposhkin would have received a Nobel prize for figuring out what stars are made of, in a fairer world. link (1h4m John Rudy) from wikipedia: |
a British-born American astronomer and astrophysicist who proposed in her 1925 doctoral thesis that stars were composed primarily of hydrogen and helium. Her groundbreaking conclusion was initially rejected because it contradicted the scientific wisdom of the time, which held that there were no significant elemental differences between the Sun and Earth. Independent observations eventually proved she was correct.
|May 5, 2021||Space Debris: A Big Problem (Georg Kirchner) |
When the first satellites were launched some 60 years ago, space was more or less empty. However, the ever increasing launching activities since that now have created a rather crowded environment above our heads: More than 30.000 space debris objects – old / defunct satellites, upper stages of rockets, remaining parts after explosions of collisions etc. – are now orbiting in different altitudes, tracked by radar, laser and passive optical telescopes. The possibility of collisions is already rather high: Collision warning systems create already more than 1000 warnings per day (!) of close encounters between 2 objects – and sometimes this is TOO close – and a collision between two space debris objects, at velocities of 27.000 km/h, creates several 1000 new space debris parts…
Satellite Laser Ranging (SLR) has demonstrated during the last years the capability of tracking such debris objects, helping to determine their accurate orbit, and also their tumbling motions – important features if you want to catch an old upper stage, and remove it from space.
Dr. Georg Kirchner is a group leader at the Space Research Institute, Department of Satellite Geodesy, Austrian Academy of Sciences in Graz, Austria.
|watch the presentation||34|
|May 12, 2021||What Was It Like: I Lived In Antarctica Ivor Morgan lived in Antarctica from late 1961 to early 1964 and worked for the British Antarctic Survey (BAS) as a surveyor in topographic and hydrographic mapping of the Antarctic Peninsula. His most recent trip south was 5 years ago. The Antarctic Peninsula is still the primary focus of BAS bases. A major secondary area was the Base at Halley Bay on the south of the Weddell Sea—and today almost in it. Ivor will explain more during his talk. He'll also go over maps of Antarctica to help you become familiar with this interesting and unique continent.||Watch the presentation||44|
|May 19, 2021||Potpourri |
> Extraterrestrial. The First Sign of Intelligent Life Beyond Earth (Ken Cutter discusses this book on 'Oumuamua. If you don't know what this is about, then you should join the meeting and find out.)
> Rober and Jello link (10m30s)
> 3-year effort to video two vortex rings colliding in super slow motion. link; 8min
> Synchronization link; 20min
|Watch the Oumuamua presentation||30|
|May 26, 2021||>Helicopter flight on Mars (George Gamota)||Watch the presentation]||33|
|June 2, 2021||Telephone Switching Before Computers (Ken Pogran)|
When we think about telephone switching today, we may think of all-digital, computer-based systems humming along quietly in shiny computer rooms. But go back 50, 80, or 120 years, and you'll find calls are handled by clattering behemoth electromechanical switching systems, some with racks and frames 14 feet tall, and some motor-driven, with clutches and commutators and rods with brushes that scamper up and down. In this talk Ken will take us through the evolution of telephone switching systems, from an undertaker's invention of the late 1880s through the Bell System's urban giant “panel” systems of the 1920s and '30s and on up to the No. 1 and No. 5 crossbar systems of the late '30s, '40s, and '50s. On the way we'll look at the overall architecture of telephone switching, problems of scalability, and the No 5 crossbar “marker”–the most complex relay-based computing machine ever produced.
|watch the presentation||37|
|June 9, 2021||Quantum Engineering of Superconducting Qubits. William Oliver, associate professor of EE and Computer Science at MIT and fellow at Lincoln Lab. (Rich Ralston). The abstract of his talk: |
Superconducting qubits are coherent artificial atoms assembled from electrical circuit elements and microwave optical components. Their lithographic scalability, compatibility with microwave control, and operability at nanosecond time scales all converge to make the superconducting qubit a highly attractive candidate for the constituent logical elements of a quantum information processor. Over the past decade, spectacular improvements in the manufacturing and control of these devices have moved the superconducting qubit modality from the realm of scientific curiosity to the threshold of technical reality. In this talk, we present the progress, challenges, and opportunities ahead in engineering larger scale processors.
|Watch the presentation||31|
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|Date||Topic and links|
|Jan 8, 2020||Ig Nobel 2019 Awards awards for dubious inventions (Peter Albin) link to Improbable Research page||watch the presentation|
|Jan 15, 2020|| How we accomplished the change from Yahoo Groups and using the new system (30min, Steve Isenberg) Slides |
 Windows Security Settings and Windows 7 Anti-Malware (30min, Gary Patrick) Slides
 Alternatives to TV servers: new ways of getting programming (30min, Steve Isenberg) Slides . 2010 NY Times article . Spreadsheet shows service vs content
| Watch the presentation |
 Watch the presentation
 Watch the presentation
|Jan 22, 2020||Tesla-Marconi conflict their radio-related patent war from 1900-1943 (Bob Primak) Presentation notes||Watch the presentation|
|Jan 29, 2020||Potpourri Ken Cutter spoke on UFO's slideset and the history behind speed of light measurements slideset. |
John Rudy showed a video from Broad Institute (pronounced, bro-awd): Overall view of Broad Institute and the presentation we watched, human genome revolution past, present, and future.
John Rudy mentioned that there are some MOOC classes on introduction to biology, see info at this edx link (MOOC=Massive Open Online Course)
|Feb 5, 2020||Career Day Attendees discuss interesting things from their career.||Watch the discussion|
|Feb 12, 2020||Space Update (George Gamota)|
|Feb 19, 2020||Who’s Afraid of the Big Bad AI This is a later presentation, and therefore improved over an earlier presentation. |
(John Rudy will coordinate.)
|watch the video|
|Feb 26, 2020||Patents – What they are, a brief history of patents, how to read them, and how to obtain them||watch the presentation|
|Mar 4, 2020||Patent Licensing from Universities (Lita Nelson)||watch the presentation|
|Mar 11, 2020||Geodesy, its properties and tools, presented by Mike Pearlman of the Harvard-Smithsonian Center for Astrophysics Program on Geodesy |
Geodesy is the science of accurately measuring and understanding three fundamental properties of the Earth: its geometric shape, its orientation in space, and its gravity field— as well as the changes of these properties with time.
Space Geodesy uses sources external to the Earth: artificial satellites (in satellite geodesy), quasars (in very-long-baseline interferometry, VLBI), and the retroreflectors on the Moon (in lunar laser ranging) to measure these static and time varying properties.
Of current interest are measurements to monitor geodetic parameters and their temporal variations in a global reference frame with a target relative accuracy of 10E-9 – 10E-10, for both scientific understanding of the Earth system and understanding their potential impact on society
Fundamental to these measurements is a reference frame that provides stability over space, time, and evolving technology.
|watch the presentation|
|Mar 18, 2020||Tracking New Diseases: Medical issues incl Vaping (Jerry Slate)||watch the presentation||45|
|Mar 25, 2020||Patents for high technology (and when not to have them) (Dick Wagner)||watch the presentation||44|
|Apr 1, 2020||3D Printing and Robotics in Industry: An Update (George Burnell) 3D Printers fighting Coronavirus (link from PeterA)||watch the presentation |
|Apr 8, 2020||Christine Muir, Community Librarian at Cary Library, will demonstrate how to access all the online resources offered by the library. There is no fee for any of these resources, which include ebooks, digital audiobooks, movies, music, TV shows, newspapers, and more.||watch the presentation||41|
|Apr 15, 2020||Futurism We started with something different (Cute Brother and Sister); and then |
a couple of videos by/with Amy Webb (a quantitative futurist, professor of strategic foresight at the NYU Stern School of Business and founder of the Future Today Institute)
Ted Talk on hacking online dating (17 mins)
presenting the 2019 Emerging Tech Trends Report (60 minutes) at SXSW in March 2019
relevant links for your offline reference include https://amywebb.io/
There were several links shown during the videos: http://bit.ly/FTI2019TechTrends (this links to the 2020 report), http://bit.ly/SXSW2019TechTrends, and the “TWiT” program we watched at the end http://twit.tv/subscribe (and there's lots to subscribe to!!) and http://twit.tv/live
|Apr 22, 2020||Potpourri Gary Patrick with information on Encryption and some Utilities. |
Charly Sestokas with computer buying tips, etc; HD vs SSD; SD Longevity; MS Surface;
plus Potential House Fires from Phone, Tablet, Laptop, other Electronic Charging setups
|watch the presentation |
the presentation with captions
|Apr 29, 2020||The Science behind Columbus (Bob Melanson) |
Bob finishes this up on July 15
|watch the presentation |
|May 6, 2020||The Manhattan Project first part (Charles Holbrow)||watch the presentation||58|
|May 13, 2020||Nuclear Power Generation (David Kahan)||slides |
watch the presentation
|May 20, 2020||Boost-Phase Defense against ICBMs presented by Dan Kleppner. |
Because little was known publicly about the Bush proposal, the American Physical Society initiated a study. Our presenter was co-chair of the study group. Although the study is fifteen years old, little has changed.
watch the presentation
|May 27, 2020||George Burnell Part II |
Continuation/conclusion of George Burnell's earlier presentation on 3D printing
|watch the presentation||26|
|June 3, 2020||The Manhattan Project - part 2 (Charles Holbrow)slides||watch the presentation||46|
|June 10, 2020||Potpourii NY Times article dealing with privacy (Peter Albin) |
Phone tracking of people (Charlie Holbrow)
The Immortal (BBC program)
|June 17, 2020||Sabermetrics The Statistical Analysis of Baseball (Andy Andres) |
Andy Andres is a senior lecturer of natural science at the Boston University College of General Studies who is an expert in exercise physiology, nutritional biochemistry and baseball. In addition to the work listed above, Andres writes, lectures, and speaks to the media about the effects of steroids on baseball players, and he teaches a course at Tufts University in sabermetrics, the data-driven analysis of baseball performance. These pursuits allow the lifelong Red Sox fan and athlete to synthesize his twin loves: baseball and scientific inquiry. Andres is also an MLB datacaster at Fenway Park, a Data Analyst for BaseballHQ.com and Head Coach/Lead instructor for the MIT Science of Baseball Program. In the spring of 2014, Andres will teach a MOOC (Massive Open Online Course) titled “Sabermetrics 101: Introduction to Baseball Analytics” on the edX platform.
SABR: Society of American Baseball Research
|watch the presentation||33|
|June 24, 2020||MOOC Massive Open Online Courses – What's there, what's new. (John Rudy, Charlie Holbrow) |
Broken into three presentations: John's talk on available MOOCs, Charlie's talk on MOOCs, and Q&A discussion.
Slidesets to the right.
watch the presentation
|July 1, 2020||Variety Special with Bob Primak and John Rudy on SUMo updater, other topics presented by Steve Isenberg including: Getting loads of music files legally for free after inexpensive application purchase; Video on Deepfakes (how it's done), and a video on Virus Mobility (a haha). Here are links to what we presented and displayed: |
Updater apps: SUMo Application Updater (Win) [SUMo Details] Ninite Windows Application Updater
Download/convert apps: Any Video Converter - Downloads YouTube vids and converts formats (Win, Mac) 4K Video Downloader
Listen/Watch/Record apps: RadioTracker - download music from Internet (Win) Audials, extension of RadioTracker, music and video download and more (Win)
Videos played: How Deepfakes Work A Virus Walks into a Bar
|SUMo slides |
watch the presentation
|July 8, 2020||5G and Internet of Things in the Age of Coronavirus (Bob Primak) |
Slides References 5G Networks 5G Spectrum Bands
|watch the presentation||41|
|July 15, 2020||Potpourri |
last part of Bob Melanson's Columbus presentation started on 4/29
The Physics of Sailing
Q&A from Bob Primak's 5G talk last week, 7/8
Onboard automotive diagnostics (Bill Quinn) slides
|watch the presentation||42|
|July 22, 2020||Video on Secrets of the lost Antikythera; A 2000 year old computer. (Jonathan Goode) link. |
Brief intro to using Davinci Resolve to produce a slideshow video (Steve Isenberg)
|July 29, 2020||Frontline AI part 1 (AI for the Masses) Frontline: In the Age of AI |
Related articles (thanks Peter) T-Shirt makes you invisible NIST looks into face mask effects on face recognition
|August 5, 2020||Back to the Basics – Office Tools |
Interesting Excel Spreadsheet uses (Jonathan)
neat applications of functions (SteveI) Sample spreadsheet (Excel version) and LibreOffice (.ods) version
|watch the Presentation||44|
|August 12, 2020||More on AI. The Rise of Artificial Intelligence||27|
|August 19, 2020||How to Build a Time Machine |
What Happens When You Respond to Spam (Peter Albin presented)
|August 26, 2020||Myths and Facts on Climate Change - a non-alarmist perspective Presented by Shelly Lowenthal who says: “I developed a class on climate change that I give to life long learning organizations. It’s part of my History Course that I present. … There is science involved.” |
Shelly recommends that you watch Michael Moore's movie on YouTube, “Planet of the Humans” https://www.youtube.com/watch?v=Zk11vI-7czE (1hr 40min) before the meeting. It is a documentary on wind and solar green energy.
Here's a 37 second teaser for the movie:https://www.youtube.com/watch?v=4pXCftKF4uI
|watch the presentation||42|
|Sept 2, 2020||Count Rumford and his 18th Century Technology Innovationns Dan Kleppner: Quite a few years ago I became interested in Benjamin Thompson (1752-1814) , aka Count Rumford. He was a great applied scientist and we owe much of our modern domestic technology to him: the kitchen range, double boiler, layered clothing and thermal underwear, steam heating,…. He was the first person to clearly understand all the modes of heat transfer. He was a public benefactor, initiated poor houses in many European cities, and he founded the Royal Institution in London which supported the research of Michael Faraday His career was a series of rags to riches. He would be better remembered if it were not for a character flaw: he antagonized everyone he dealt with to such a degree that he had to flee the country time and again.||watch the presentation||41|
|Sept 9, 2020||Blind Bombing by Norman Fine |
“I found this book spellbinding and with insight into the development of a new and advanced secret radar system that permitted the allies to penetrate through inclement weather and enable the allies to reverse the dominance of the Nazis at the onset of WWII. Blind Bombing has a warm sensitive side, in that Norman Fine’s uncle (Stanley) brought the first production model of the new airborne radar system to Europe permitting allied bombers to destroy factories supplying the German forces that were usually obscured by overcast weather”.
|watch the presentation slides||30|
|Sept 16, 2020||Potpourri |
What to do with your family during a pandemic? (George Gamota)
Update of Elon Musk's Starlink Satellite Internet Project (Bob Primak)
There were videos we could not include in this presentation. Here are links to them:
Video of the launch, fairing recovery, and booster return, and landing on a ship: https://www.space.com/spacex-starlink-11-satellites-launch-september-2020.html
Launch and first stage separation and landing: https://www.youtube.com/watch?v=7Ei_Z_Xv3BM
Deployment of satellites: https://videos.space.com/m/N9qB26JP/watch-spacex-deploy-60-starlink-satellites-in-amazing-view-from-space?list=9wzCTV4g
Fairing recovery (previous launch in July): https://www.space.com/spacex-falcon-9-rocket-payload-fairing-catch-success.html
Another “filler” video we showed: harvesting spaghetti
|Presentation videos: |
Pandemic What To Do
|Sept 23, 2020||The future of music – production and delivery by Charles J Holbrow (CJH). What can we learn about the future or music and music technology by looking at the past? I will present examples that illustrate the evolution of musical ideas and technologies from their conception to how they have influenced and continue to influence popular music today. I will describe how popular music is created today and review some research-stage music production technologies that aim to influence the current music production paradigms. As part of my PhD studies at the MIT Media Lab, I am developing software to enable a new kind of online musical collaboration and distribution. I will conclude by showing you an early example of this software |
Who is CJH? His early education was in Germany. His high school was the Sudbury Valley School, an alternative school in Sudbury, MA. After a year at Middlesex Community College, he transferred to UMass Lowell where he majored in sound recording technology and performance (piano). Following jobs developing software for games, he took up an internship at MIT's Opera of the Future program with noted composer Prof. Tod Machover. Subsequently, CJH was admitted into MIT's Media Arts and Sciences program from which he expects soon to receive a Ph.D. He is Charlie Holbrow's grandson.
The Media Timeline: Use mouse to zoom in/out; on Apple trackpad, two-finger up/down gesture to zoom; click and drag to pan the view.
|watch the presentation slides||40|
|Sept 30, 2020||Covid-19 Update (Jerry Slate)||watch the presentation||50|
|Oct 7, 2020||Producing a TV Show using DaVinci Resolve (Steve Isenberg)||watch the presentation||33|
|Oct 14, 2020||The CAC Ken Pogran tells about the Lexington Communications Advisory Committee. How did it start, what are its responsibilities, what are today's issues.||watch the presentation||27|
|Oct 21, 2020||Harry Forsdick: ARPAnet & Internet Conferencing||watch the presentation||39|
|Oct 28, 2020||Potpourri Slide Rules (remember them?) (Ken Schwarz) |
The Saga of John Rudy's New TV
A bit on Zoom Webinars (John Rudy)\\Recycling electronics (John Rudy)
Nuclear R&D Progress Update (David Kahan)
|(unable to create video)||41|
|Nov 4, 2020||Atomic Clocks and, a brief history of Time (Dan Kleppner)||watch the presentation||37|
|Nov 11, 2020||Atomic Clocks (part 2) by Dan Kleppner |
followed by (and not in recorded presentation) mRNA: Transforming Medicine
|watch the presentation||27|
|Nov 18, 2020||Speech Input and Translation. George Gamota on Google Translate. Peter Albin on history of translation and voice recognition. Jerry Slate discusses and demonstrates Naturally Speaking. Video on Amazon Transcribe Amazon Transcribe is Now Generally Available||watch the presentation||44|
|Nov 25, 2020||Vacation/no meeting|
|Dec 2, 2020||Potpourri |
One man's attempt to build a squirrel-impervious bird feeder (from John Rudy/20 min)
Sand on the Table - Harmonics
Ted Talk: Is Translation Easy? (17 min)
How Trees Talk to Each Other (Suzanne Simard) (found by CharlieH) (18 min)
|Dec 9, 2020||Sara Seager/Distinguished MIT Professor in Physics, Astronomy, Earth Science on Venus (the planet) 1hr |
Scientific approach to, yes, defogging your car's windows (by the Squirrel guy)
|Dec 16, 2020||Acoustic Detection & Localization of an Active Shooter or Sniper presented by Tony Galaitsis |
Deranged shooters and terrorist or enemy snipers have been a concern for a long time. Technological advances over the past few decades have used gunfire acoustic information to detect and localize active shooters and snipers in order to prevent or minimize their deadly impact. This presentation reviews the general state of acoustic shooter/sniper detection and localization, based on publicly available information found on the internet (YouTube videos, Wikipedia, manufacturer brochures, and published papers/patents) and some basic geometry.
|watch the presentation||29|
|Dec 23, 2020||Vacation - Enjoy the holidays!|
|Dec 30, 2020||Career stories (update). People with careers during which interesting (and now unclassified) things have happened. Mistakes made, lessons learned. |
Learn from: Carl Laxarus, Bill Haley, Mike Alexander, Dick Wagner, George Burnell, David Kahan, and Dan Kleppner
|watch the presentation||37|
click to show 2019 past meetings
Click to hide past 2019 meetings
|Date||Link to Video(s)||Slides/notes|
|Dec 25, 2019||Christmas - no meeting |
Your homework is to celebrate the good things in life.
|Dec 18, 2019||Potpourri John Rudy continues AI in Medicine; Steve Isenberg on Cloud File Storage Options|
|Dec 11, 2019||AI in Medicine MIT Alum Newsletter AI in Medical Care|
|Dec 4, 2019||Tech trends and holiday gift ideas (Peter Albin and Bob Primak) Watch the presentation Slides|
|Nov 27, 2019||Happy Thanksgiving! No meeting.|
|Nov 20, 2019||Dark Web. “The legitimate uses of TOR, which is the software on which the so-called Dark Web runs. |
Or, if more interesting, a tour of the Dark Web“ https://darkwebtours.weebly.com/ Watch the presentation
|Nov 13, 2019||Steering committee|
|Nov 6, 2019||Backup Strategies (Peter Albin) Watch the presentation||Slides|
|Oct 30, 2019||Space colonies in Solar Orbit |
The book describing our design study is available at:
Watch the Presentation
|Oct 23, 2019||Tesla vs Edison (Bob Primak) Watch the presentation||Bob's paper|
|Oct 16, 2019||Potpourri: |
Flying Saucers – from material written by George Adamski;
Deep Fakes video;
Windows 10 tips (askwoody.com, you may need to become a member with voluntary paid membership; Backing up your device drivers; Getting those old games back into Win10, like FreeCell, Hearts, Solitaire, Chess, Minesweeper; discussion on when to and not to update to “the latest” Win10 release (consider: consult askwoody.com which today advises NOT to patch MS patches.) Gary's slides
|Oct 9, 2019||Yom Kippur, no meeting|
|Oct 2, 2019||Science/Technology Rivalries: Newton vs. Liebnitz vs. Hooke (Charlie Holbrow) Watch the presentation (note: video is missing for part of the presentation)||handout|
|Sept 25, 2019||Application of physics techniques to biology. Gene Surfing and Survival of the Luckiest, David Nelson, Professor of Physics, Harvard (friend of Harry Forsdick). Population waves have played a crucial role in evolutionary history, as in the “out of Africa” hypothesis for human ancestry. Population geneticists and physicists are now developing methods for understanding how mutations, number fluctuations and selective advantages play out in such situations watch the presentation|
|Sept 18, 2019||Cogito. A few weeks ago Mitch Wolfe sent out two very thought provoking links regarding the new science of voice technology, including what can be gathered by voice analysis using AI. We are fortunate to have Ali Azarbayejani, Cogito's CTO, visit and speak with us about the technology used by this local company which makes software that analyzes phone conversations and provides real-time guidance to help service employees better engage and connect with customers. Watch the presentation|
|Sept 11, 2019||Jonathan Goode discusses many interesting (and amazing) computer details including fonts |
Bob Primak on the Laser Scanning of St Pauls Cathedral and an update on the cleanup of Notre Dame Cathedral
|Notes on Bob's talk
High lead levels found in Notre Dame WSJ Article, Reconstruction work is on hold due to lead
|Sept 4, 2019||AI for People in a Hurry (short) and Setting Rules for the AI Race, plus a pre and post view discussion. Meeting led by Larry Wittig.|
|Aug 28, 2019||Dava Sobel’s Google talk on “The Glass Universe”, women in Science (a Google Talk video) |
JohnR will introduce the subject and speaker, we'll watch the video, and discuss it and related topics afterwards
see also Constructing the Glass Universe by Dava Sobel. Additional info on and about this topic, by Gary Patrick–includes comments on the video and more.
|Aug 21, 2019||“UNIX, Linux - Origins, History, Ongoing Futures”, a talk presented by Charly Sestokas (note, talk will not be recorded) |
plus a 30-minute video about SpaceX, presented by George Gamota
|Aug 14, 2019||Potpourri. |
Eli Brookner finishes his talk on Radar and Einstein
CharlyS on Storage (not recorded).
How to use LexMedia to view videos on demand
|Aug 7, 2019||Eli Brookner "Snoopy on Radar & Phased Arrays & Einstein's Duality Theory – An Update." part 1 (90 min)|
|July 31, 2019||Eight Days to the Moon and Back - focus on Apollo 11 [George Gamota]|
|July 24, 2019||Breaking the WWII Enigma Machine (Material from the April 2019 Lexington Veteran’s meeting, search LexMedia On Demand for “Enigma”) [Rudy]|
|July 17, 2019||Potpourri including Steve Isenberg on virtual credit cards, space elevators, and more (planningpage) recording of presentation|
|July 10, 2019||Apple Computer, History and Devices, by Josh Turiel see the presentation|
|July 3, 2019||No Meeting due to Holiday|
|June 26, 2019||Update on 5G (Bob Primak) see the presentation|
|June 19, 2019||Black Hole 60-minute video (Gamota) plus|
|June 12, 2019||From talks at Google Frank Abagnale: "Catch Me If You Can" |
and A new way to remove CO2 from the atmosphere (Jennifer Wilcox)
|June 5, 2019||3D Reconstruction. Used for churches and other buildings. (Bob Primak)|
|May 29, 2019||Potpourri including Y2K. What was it, why did it happen, was it real? (John Rudy) and Gary Patrick on Windows Issues|
|May 22, 2019||Potpourri. Showed several movies. Vaccines calling shots |
The Ingenious Design of the Aluminum Beverage Can
The strange tale of the Norden bombsight
|May 15, 2019||Career stories. Come prepared to tell us about your technical experiences. |
(We have done this 2-3 times before; but not recently).
|May 8, 2019||Ray Kurzweil + Disruptive Technologies and Dangerous Ideas Singularity University co-founder, Google AI Director and noted futurist Ray Kurzweil joined Peter H. Diamandis for a 90-minute Ask Me Anything, all aimed at providing you an unfair advantage for your business.||https://youtu.be/SaOfLtoaKqw|
|May 1, 2019||Potpourri and Steering Committee|
|April 24, 2019||Documentary on Neil Armstrong||Gamota|
|April 17, 2019||History of the World in 100 Objects (continued). We listened to The mechanical galleon, Mexican codex map, Ship's chronometer from HMS Beagle, and Solar powered lamp and charger||British Museum site
|April 10, 2019||Madame Curie video about Madame Curie and the Curie family, presented by Charlie Holbrow. Madame Curie and the Curie family will focus on her and her daughter and their characters and discoveries and how they fit into the sequence of dramatic developments in physics between the discovery of radioactivity in 1897 and the discovery of nuclear fission in 1938. This will include some description of Lise Meitner's role in these developments and a brief mention of why she didn't get a Nobel for the discovery of nuclear fission. |
For those interested, Amazon has the movie Radioactive about Marie Curie's work (free to Amazon Prime members)
|handout that wasn't handed out How the Curies' piezo device worked and measured small electric current|
|April 3, 2019||Showing the 2014 AI movie Ex Machina: A young programmer is selected to participate |
in a ground-breaking experiment in synthetic (artificial) intelligence (AI) by evaluating
the human qualities of a highly advanced humanoid. Very intriguing movie.
|FYI, the movie is available on NetFlix.|
|March 27, 2019||Computer History Museum (Mountain View, CA) interview with Frank Heart (who in 1969 led the team of BBN engineers that created the ARPANET). |
slightly shortened version
|March 20, 2019||George Gamota shows video "Journey through the Milky Way" |
And relating to the end of the program, info on Detecting Dark Matter
New: Milky Way Bulge
|March 13, 2019||Password Managers |
Slides (with links) for the presentation
Will your password stand up to a cracker?
Is your password or account info out on the web?
Newsletter 4/15/2019 discussing password managers
About Keeper Password Manager
Keeper website screenshots
|March 6, 2019||History of the World in 100 items. Presenting a representative sample of the 100-part series of 15 podcasts by Neil MacGregor during his time as Director of the British Museum that explores world history from 2 million years ago to the present. We listened to The Flood Tablet, Hebrew Astrolabe, and Ming Bank Note.||British Museum site
|February 27, 2019||George Gamota presents "2018 Space Events/Discoveries" plus 10 minute update on "Trump's Science Appointees"||Space Update slides
Trump Science Appointees slides
|February 20, 2019||Charlie presents the first of 3 talks on quantum physics, today's subject is "why wave-particle duality makes such a disturbing theory necessary"||Powerpoint slides
Wave Particle outline -- Why we need quantum mechanics
|February 13, 2019||Windows System Maintenance and Updating (Bob Primak) part 1||PDF of Bob's slides|
|February 6, 2019||The Power Grid (presented by Jackie Zajac)||PDF of Jackie's slides|
|January 30, 2019||2019 lg Nobel awards ceremony (presenter Peter Albin) |
Awards Ceremony Improbable Research home
|“Research that makes people LAUGH and then THINK”|
|January 23, 2019||Shown: |
TED Talk String theory - Brian Greene
The greatest dance sequence ever
The best stats you've ever seen
The tyranny of the rocket equation
Not shown but of possible interest
TED Talk Why is our universe fine-tuned for life? - Brian Greene
10 Fascinating Examples of Unintended Consequences
|January 16, 2019||Mathematics of Weight Loss |
10 Times Michio Kaku Arguments Blew Our Minds
TED Talk The freakonomics of McDonalds vs Drugs by Steve Levitt
|January 9, 2019||Michael Rosenblatt, MD on "Ways That Wartime Injuries Have Influenced Civilian Medical Practice"||link to slides on Yahoo|
click to show 2018 past meetings
Click to hide past 2018 meetings
|December 19, 2018||Yumio Saneyoshi on "The State of Computer Programming Education for Youth"|
|December 12, 2018||Dr. Reinier Beeuwkes on "Fusion at MIT"|
|December 5, 2018||Endocrine system (no video)||Stress, Portrait of a Killer
slides are on the group Yahoo page
|November 28, 2018||Gary Patrick on "Current Windows Security Software"||PDF of Gary's slides|
|November 7, 2018||Kathryn Flanagan on "The James Webb Space Telescope"|
|October 31, 2018||Harry Forsdick on "The Economics of Bitcoin"||Slides|
|October 17, 2018||Steve Isenberg on "Blockchain Technology"||PowerPoint Slides|
|October 10, 2018||Larry Wittig on "Encryption"||PDF of Larry's slides|
|October 3, 2018||Bruce Cohen on "The Science of Psychiatric Disorders and Their Treatment"|
|August 1, 2018||Isabel Greenstein and Charles Wang on "What Is Social Media?"|
|July 18, 2018||George Gamota on "Is China the New Science Superpower?"||info on current changes in China:
in BBC News
|July 11, 2018||Alan Levine on "Exoplanets" part 1|
Click to show potential topics
Click to hide potential topics
We'd like your thoughts on these and other topics you are interested in seeing or maybe presenting. Send your thoughts via email to
info@LCTG.toku.us or contact John Rudy, Peter Albin, Bob Primak, or Steve Isenberg directly – Thank you.
This list last changed 2021.06.03 18:45
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Some topics I propose within the next year, including the August 21 meeting.
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