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General Discussion

16195 threads, 328675 comments (10 Viewing)

Chinese spy balloon

02/04/2023 by HiTekRedNek
A rather simple solution to the balloon gathering information would be to shoot small holes (Something like a shotgun with bb size shot would do it) i...
Views: 391, Comments: 110
Last comment 02/07/2023 by Sapling

Gun barrel manufacturing

01/29/2023 by deanpavil
The Puckle gun was designed in the 1700's and was a repeating flintlock style weapon. One of its features was that it fired square bullets. The dr...
Views: 303, Comments: 5
Last comment 01/30/2023 by Rixter

Are space and time physical non-realities?

01/29/2023 by WJMFIRE
Bell's theorem postulated that information could not travel faster than the speed of light and this was later "verified" by testing. Einstein didn't...
Views: 350, Comments: 35
Last comment 02/07/2023 by PWSlack

deodorant spray death

01/26/2023 by HiTekRedNek
After reading about a death caused by inhaling deodorant spray,I was thinking there must be a better way to dispense aerosols. It occurred to me to u...
Views: 256, Comments: 21
Last comment 01/30/2023 by Anonymous Poster
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Commercial Space

2114 threads, 4313 comments (1 Viewing)
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CR4 Feedback

727 threads, 12590 comments (3 Viewing)

Loss of editing icons when replying to threads.

01/22/2023 by Randall
When replying to threads:- I've lost the editing icons and ability to paste screen shots again, and, none of the tricks that worked before seem to wo...
Views: 235, Comments: 19
Last comment 01/26/2023 by dkwarner
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Section Blogs

Challenge Questions

419 blog entries, 30590 comments (3 Viewing)

Back to 48 U.S. States? (February 2023 Challenge Question)

You are voted the very first apolitical president of the U.S. and you must eliminate two extant states using ONLY logic and reasoning. Which two do y...
Views: 234, Comments: 34
Last comment 02/05/2023 by Anonymous Poster

Unlocking Logic (Jan. 2023 Challenge Question)

Here's a hypothetical that requires some analytical reasoning. Which way do locks rotate: counter-clockwise, clockwise or both? Can you find determin...
Views: 733, Comments: 16
Last comment 01/30/2023 by HiTekRedNek
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Other Blog Entries of Interest

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: 439, 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: 291, 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: 172, 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: 184, Comments: 8
Last comment 08/18/2020 by canadianslidewinder

Space-Propertime Structure and Acceleration

08/07/2020 posted in Relativity and Cosmology
by Jorrie
I have introduced the idea of Epstein Space-Propertime Diagrams (ESPD) in my previous Blog post. To refresh, here is the ESPD's structural relationshi...
Views: 229, Comments: 6
Last comment 08/08/2020 by Jorrie