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16736 threads, 322037 comments (16 Viewing)

Where did the Big Bang Happen?

09/26/2021 by SolarEagle
Was it the center of the universe? I've always wondered about that... Now it's clear that nobody knows anything....haha
Views: 27, Comments: 5
Last comment 09/27/2021 by HiTekRedNek

Burning Lichtenberg Figures

09/24/2021 by K_Fry
Burning Lichtenberg figures into wood, as decoration, is something of a fad. I have watched as much as I can stand of many videos on the subject, and...
Views: 120, Comments: 6
Last comment 09/27/2021 by Brave Sir Robin

Sir Clive Sinclair - Rest in Peace

09/19/2021 by Sid_Sidow
With the passing of Sir Clive this week, it certainly takes me back to my beginning of understanding computers. I bought a kit of the ZX-81 and solder...
Views: 142, Comments: 5
Last comment 09/21/2021 by horace40

Electric School Bus; Seems Like a Natural

09/19/2021 by SSCpal
School busses are only used for a few hours/day; the rest of the time they sit, so recharging is not a problem. And in use they don't go far, so range...
Views: 236, Comments: 35
Last comment 09/25/2021 by SolarEagle
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Commercial Space

2110 threads, 4287 comments (0 Viewing)
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CR4 Feedback

737 threads, 12520 comments (0 Viewing)
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Section Blogs

Challenge Questions

404 blog entries, 30155 comments (0 Viewing)

Two Trains, a Bird and Crash (Sept. 2021 Challenge Question)

It's 1870 and the Transcontinental Railroad has just been completed. A Central Pacific steam locomotive leaves San Francisco at 15 miles per hour at...
Views: 1057, Comments: 85
Last comment 09/04/2021 by Griffex

Broken Billiard Balls (August 2021 Challenge Question)

You are the proud owner of eight billiard balls. You believe one of them is defective, and weighs more than the others. You are also the proud owner...
Views: 1355, Comments: 33
Last comment 09/01/2021 by SolarEagle
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Five Ways to Make Your Employees Feel Valued

1 blog entries, 7 comments (0 Viewing)

Five Ways to Make Your Employees Feel Valued

02/21/2021 by ahorner_22
It’s no secret that 2020 was a tough year. People experienced challenges they’ve never experienced before. For anyone running an essential...
Views: 245, Comments: 7
Last comment 03/03/2021 by Anonymous Poster
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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: 375, 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: 280, 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: 168, 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: 180, 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: 222, Comments: 6
Last comment 08/08/2020 by Jorrie