Speaker schedule management link (John Rudy)

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 (goes to John and others), (John only), or call John at 781-861-0402. We look forward to have you join us!

Join the Email List

To receive notices of upcoming meetings and join discussions, send an email to and include in the body of your email:

  • Your full name
  • Town of Residence
  • Brief self-introduction and your interest in the group
  • Optionally, topic(s) of interest you might present or share at a group meeting

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.

2019.07.24 21:09 · smismi7

Presenting to the group, how to get it going in Zoom
schedule is up-to-date as of 4/22/2020. (Next tentative planning meeting around July 1, 2020)

Date Planned Topic
July 8, 2020Update on the Internet of Things in the Age of Coronavirus (Bob Primak)
July 15, 2020Potpourri Tips for Using Zoom (Peter, SteveI)
Onboard automotive diagnostics (Bill Quinn)
Right to Repair - who has the right to repair your car; vendor lockout (speaker TBD)
last part of Bob Melanson's Columbus presentation started on 4/29
July 22, 2020Weldon Nelson has suggested the following: a 2000 year old computer. I watched this 46-minute presentation and found it fascinating link.
Presentations with other lengths show up on my Google search for “secrets of the lost Antikythera”. (Jonathan Goode)
July 29, 2020Frontline AI part 1 (AI for the Masses)
August 5, 2020Advanced features of Excel and Word (Speaker TBD)
August 12, 2020Frontline AI part 2 (see 7/29 for part 1)
August 19, 2020Selected videos (Peter)
August 26, 2020Potpourri Old tech: Reuse, Recycle, Renew. Ideas for reusing/repurposing computers, tablets, phones you're not actively using any more
* home theater, camera monitor, media player
* Recycling (Best Buy? Staples?)
* Linux
Sept 2, 2020Best of Freakonomics (Peter Albin has link to 70min video)
Sept 9, 2020
Sept 16, 2020
Sept 23, 2020
Sept 30, 2020Covid-19 Update (hopefully post-mortem) (Jerry Slate) (tentative)
Oct 7, 2020

“fup” = “Follow-up”

In The Works/Presentation Topics Being Considered

  • Scams, spyware, freeware. Spotting/detecting them and avoiding them. (idea)
  • Blind Bombing by Norman Fine. Fine is native of Newton MA and would be receptive to giving a presentation. [Larry Freier]
    “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”
  • History relating to Rubber
  • Florence Nightingale contributions to science
  • Search for life on other planets (research in progress).
  • AI and Job Loss (Yumio?) – originally scheduled for 7/1/2020
2020.01.22 13:08 · smismi7

DateTopic 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[1] How we accomplished the change from Yahoo Groups and using the new system (30min, Steve Isenberg) Slides
[2] Windows Security Settings and Windows 7 Anti-Malware (30min, Gary Patrick) Slides
[3] Alternatives to TV servers: new ways of getting programming (30min, Steve Isenberg) Slides . 2010 NY Times article . Spreadsheet shows service vs content
[1] Watch the presentation
[2] Watch the presentation
[3] Watch the presentation
Jan 22, 2020Tesla-Marconi conflict their radio-related patent war from 1900-1943 (Bob Primak) Presentation notesWatch the presentation
Jan 29, 2020Potpourri 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, 2020Career Day Attendees discuss interesting things from their career. Watch the discussion
Feb 12, 2020Space Update (George Gamota)
Feb 19, 2020Who’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, 2020Patents – What they are, a brief history of patents, how to read them, and how to obtain them watch the presentation
Mar 4, 2020Patent Licensing from Universities (Lita Nelson) watch the presentation
Mar 11, 2020Geodesy, 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, 2020Tracking New Diseases: Medical issues incl Vaping (Jerry Slate) watch the presentation
Mar 25, 2020Patents for high technology (and when not to have them) (Dick Wagner) watch the presentation
Apr 1, 20203D Printing and Robotics in Industry: An Update (George Burnell) 3D Printers fighting Coronavirus (link from PeterA)watch the presentation
chat messages
Apr 8, 2020Christine 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
Apr 15, 2020Futurism 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
There were several links shown during the videos: (this links to the 2020 report),, and the “TWiT” program we watched at the end (and there's lots to subscribe to!!) and
Apr 22, 2020Potpourri 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
chat messages
Apr 29, 2020The Science behind Columbus (Bob Melanson)watch the presentation
May 6, 2020The Manhattan Project first part (Charles Holbrow)watch the presentation
May 13, 2020Nuclear Power Generation (David Kahan)slides
watch the presentation
May 20, 2020Boost-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, 2020George Burnell Part II
Continuation/conclusion of George Burnell's earlier presentation on 3D printing
watch the presentation
June 3, 2020The Manhattan Project - part 2 (Charles Holbrow)watch the presentation
June 10, 2020Potpourii NY Times article dealing with privacy (Peter Albin)
Phone tracking of people (Charlie Holbrow)
The Immortal (BBC program)
(not recorded)
June 17, 2020Sabermetrics 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 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
June 24, 2020MOOC 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.
July 1, 2020Variety 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

video wording prep

Wording to be used in videos when posted to YouTube. If listed here, they're not on YouTube yet.

6/24 (Science & Technology)

MOOCs – Massive Open Online Courses
John Rudy, Retired Software Director

DateLink to Video(s)Slides/notes
Dec 25, 2019Christmas - no meeting
Your homework is to celebrate the good things in life.
Dec 18, 2019Potpourri 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“ Watch the presentation
Nov 13, 2019 Steering committee
Nov 6, 2019 Backup Strategies (Peter Albin) Watch the presentationSlides
Oct 30, 2019 Space colonies in Solar Orbit
The book describing our design study is available at:
Watch the Presentation
Charlie's handout
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 (, 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 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, 2019Breaking the WWII Enigma Machine (Material from the April 2019 Lexington Veteran’s meeting, search LexMedia On Demand for “Enigma”) [Rudy]
July 17, 2019Potpourri including Steve Isenberg on virtual credit cards, space elevators, and more (planningpage) recording of presentation
July 10, 2019Apple Computer, History and Devices, by Josh Turiel see the presentation
July 3, 2019No Meeting due to Holiday
June 26, 2019Update on 5G (Bob Primak) see the presentation
June 19, 2019Black 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, 20193D Reconstruction. Used for churches and other buildings. (Bob Primak)
May 29, 2019Potpourri including Y2K. What was it, why did it happen, was it real? (John Rudy) and Gary Patrick on Windows Issues
May 22, 2019Potpourri. Showed several movies. Vaccines calling shots
The Ingenious Design of the Aluminum Beverage Can
The strange tale of the Norden bombsight
May 15, 2019Career stories. Come prepared to tell us about your technical experiences.
(We have done this 2-3 times before; but not recently).
May 8, 2019Ray 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.
May 1, 2019Potpourri and Steering Committee
April 24, 2019Documentary on Neil ArmstrongGamota
April 17, 2019History 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 chargerBritish Museum site
BBC site
April 10, 2019Madame 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. handout that wasn't handed out How the Curies' piezo device worked and measured small electric current
April 3, 2019Showing 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, 2019Computer 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, 2019George 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, 2019Password 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
Related info
About Keeper Password Manager
Keeper website screenshots
March 6, 2019History 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
BBC site
February 27, 2019George Gamota presents "2018 Space Events/Discoveries" plus 10 minute update on "Trump's Science Appointees"Space Update slides
Trump Science Appointees slides
February 20, 2019Charlie 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, 2019Windows System Maintenance and Updating (Bob Primak) part 1PDF of Bob's slides
February 6, 2019The Power Grid (presented by Jackie Zajac)PDF of Jackie's slides
January 30, 20192019 lg Nobel awards ceremony (presenter Peter Albin)
Awards Ceremony Improbable Research home
“Research that makes people LAUGH and then THINK”
January 23, 2019Shown:
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, 2019Mathematics of Weight Loss
10 Times Michio Kaku Arguments Blew Our Minds
TED Talk The freakonomics of McDonalds vs Drugs by Steve Levitt
January 9, 2019Michael Rosenblatt, MD on "Ways That Wartime Injuries Have Influenced Civilian Medical Practice"link to slides on Yahoo

Neither the Lexington Computer and Technology Group nor the author of this Wiki page guarantee the application(s) listed here. While we have investigated and tried them ourselves, they come with no guarantee.

New Email List
LCTG Management Team
LCTG announcement sending process The group meets weekly on Wednesdays, 10am online. (It has previously met at the Lexington Community Center, 39 Marrett Road, Lexington but has suspended these in-person meetings during the Covid-19 situation.)
LCTG Email List Joining Process

page stats

page stats

This page has been visited 21 times today, 26 times yesterday, and 3623 total times since April 25, 2019. Thank you for your interest!

  • Last modified: 2020.07.01 17:12
  • by smismi7