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16870 threads, 325775 comments
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05/25/2022
by Rixter
This looks promising...
https://www.youtube.com/watch?v=ln5u-DETWS0
https://www.youtube.com/watch?v=H-AjRrGglCE
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05/24/2022
by HiTekRedNek
I recently read about a robot,shaped like a rat for exploring confined,small areas where access is not practical or impossible other wise.
Over 20 ye...
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2113 threads, 4308 comments
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738 threads, 12545 comments
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See all Blog Entries
Section Blogs
412 blog entries, 30332 comments
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04/30/2022
What are the practical reasons to have concave and beveled bottoms on beer cans? (Okay, so it applies to soda pop cans too.)
The image is of a flat-b...
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03/31/2022
This month's question is a bit different. Rather than a single specific answer, or set of answers, this one challenges your critical thinking.
You ha...
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7 blog entries, 20 comments
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11/21/2021
In recent weeks we’ve talked about eliminating political discussions, reporting things to moderators and also rating threads and comments.
If e...
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11/20/2021
This is CR4: Moderator justice
The moderators and administrators of CR4 are employees of Globalspec, and [a small] part of our job is to keep CR4 run...
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Other Blog Entries of Interest
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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...
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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...
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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...
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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...
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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...
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