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General Discussion

16598 threads, 335445 comments (13 Viewing)
 

Sharing a Feed

08/26/2026 by yesyen
How can I share a Feed to an unsubscribed person?
Views: 69, Comments: 5
Last comment 08/29/2026 by Deefburger
 

Hacked??

08/25/2026 by Lehman57
For Hush or anyone, I tried twice to make a reply and both took me instead to a spam site--"Your computer has been locked up . . ." Could CR4 have b...
Views: 26, Comments: 4
Last comment 08/26/2026 by Lehman57
 

Turning Industrial Waste into High-Value Green Building Materials!

08/12/2026 by Evelyn Li
Sharing a technical application on converting high-moisture industrial solid waste (ceramic residues, soil spoil, and waste gypsum) into high-strength...
Views: 37, Comments: 0
 

How Should SS 316 Capillary Tubing Be Specified for Instrumentation?

08/11/2026 by kailashmittal
For an instrumentation application requiring small-diameter stainless steel tubing, what are the most important parameters to define when specifying S...
Views: 35, Comments: 0
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Commercial Space

2214 threads, 4398 comments (0 Viewing)
 

How to Choose the Right Attachment for Skid Steers and Compact Construction Equipment

08/25/2026 by hcnwang
How to Choose the Right Attachment for Skid Steers and Compact Construction Equipment When selecting an attachment for a skid steer, compact track lo...
Views: 3, Comments: 0
 

How to Choose the Right Attachment for Skid Steers and Wheel Loaders

08/25/2026 by hcnmei
Selecting the right attachment can have a major impact on the productivity, versatility, and operating efficiency of compact construction equipment. A...
Views: 3, Comments: 0
 

Choosing the Right Hydraulic Attachment for Road and Site Maintenance Equipment

08/24/2026 by hcnwang
Choosing the Right Hydraulic Attachment for Road and Site Maintenance Equipment Road maintenance and construction contractors often need to handle se...
Views: 2, Comments: 0
 

How to Choose the Right Skid Steer Attachments for Construction and Site Maintenance

08/24/2026 by hcnmei
Title: How to Choose the Right Skid Steer Attachments for Construction and Site Maintenance Selecting the right attachment can have a major impact on...
Views: 2, Comments: 0
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CR4 Feedback

731 threads, 12629 comments (0 Viewing)
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Section Blogs

Challenge Questions

461 blog entries, 31244 comments (4 Viewing)

The Line Illusion (September 2026 Challenge Question)

08/31/2026
How many lines are there in these pictures? Explain the phenomenon depicted. (Apologies for the freehand Sharpie!) Figure 1 Figure 2
Views: 23, Comments: 2
Last comment 09/01/2026 by silvCrow

Chess Test (August 2026 Challenge Question)

07/31/2026
Use the three white pieces to place the black king (e5) in checkmate. * You do not need to simulate moves to arrive here. * Abide standard chess pi...
Views: 379, Comments: 22
Last comment 08/28/2026 by ckurilko
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Other Blog Entries of Interest

mkii Archer Automaton

11/09/2023 posted in Workbench Creations
by user-deleted-1105
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: 393, Comments: 13
Last comment 06/27/2025 by artsmith

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: 656, 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: 370, 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: 243, 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: 249, Comments: 8
Last comment 08/18/2020 by canadianslidewinder

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