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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)

01/31/2023
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)

12/31/2022
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

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