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General Discussion

16310 threads, 330900 comments (7 Viewing)

Is this real

12/09/2023 by Randall
Views: 32, Comments: 4
Last comment 12/10/2023 by SolarEagle

Christmas present ideas for technical people

12/08/2023 by BruceFlorida
Buying presents that someone will like is a tough challenge. For technically oriented people, a small list can be created that will be a "target rich...
Views: 91, Comments: 15
Last comment 12/09/2023 by SolarEagle

A Unique Watch

11/30/2023 by Anonymous Poster
A long time back I remember seeing an advert and discussion about a very expensive unique men's wristwatch [only a few were constructed (they were han...
Views: 160, Comments: 5
Last comment 12/07/2023 by Randall

Current Thinking in Neuro-degenerative Diseases

11/29/2023 by SolarEagle
Just an interesting discussion between two Doctors about gut-brain interactions, including the causes and possible treatments and strategies going for...
Views: 55, Comments: 4
Last comment 12/01/2023 by SolarEagle
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Commercial Space

2117 threads, 4315 comments (0 Viewing)
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CR4 Feedback

727 threads, 12590 comments (0 Viewing)
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Section Blogs

Challenge Questions

429 blog entries, 30770 comments (5 Viewing)

Snail Race, Part 2 (December 2023 Challenge Question)

After the fervor of last month, you are all in on snail racing. In fact you now own 25 racing snails. But now you need to identify the 3 fastest snai...
Views: 157, Comments: 12
Last comment 12/05/2023 by Ti QE

Snail Race (November 2023 Challenge Question)

You have two snails, Pepe and Mac, and you want to race them in a 10 meters-long race (for snails, it's probably a marathon). When Pepe crosses the f...
Views: 620, Comments: 25
Last comment 11/27/2023 by Anonymous Poster
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Other Blog Entries of Interest

mkii Archer Automaton

11/09/2023 posted in Workbench Creations
by Del the cat
I made a mki archer automaton out of wood a few years back, it was pretty good and it shot an arrow with a convincing action. The problem was, you had...
Views: 118, Comments: 6
Last comment 11/13/2023 by Nigh

Pesky Ellipse Circumference

10/04/2020 posted in Relativity and Cosmology
by Jorrie
When I first heard that there is no easy exact formula for the circumference of the standard ellipse, I found it hard to believe. I had already learne...
Views: 463, Comments: 8
Last comment 11/30/2020 by Haymaker

SpaceProperTime Diagrams and the Central Singularity

08/24/2020 posted in Relativity and Cosmology
by Jorrie
In my prior Blog post on the Einstein equivalence principle, I have not identified important values, like the mass of the black hole, real distances a...
Views: 293, Comments: 4
Last comment 08/25/2020 by Jorrie

SPT-Acceleration and the Equivalence Principle

08/17/2020 posted in Relativity and Cosmology
by Jorrie
One day after Alice's arrival at Deep-2, she and Dot sat down for the change of shift briefing - recall that Dot must soon return for Home leave. Whil...
Views: 173, Comments: 8
Last comment 08/18/2020 by Jorrie

Space-Propertime Structure and Acceleration II

08/11/2020 posted in Relativity and Cosmology
by Jorrie
This is a fanciful little scenario for 'flexing the muscles' of acceleration in space-propertime a little and so giving a better intuitive feel for th...
Views: 188, Comments: 8
Last comment 08/18/2020 by canadianslidewinder