Physical Sciences

Gotta Get 11 Dirac Gamma Girls, Plus 5 Doing An Imaginary Twist

they all decided to cheat and toss in an extra factor of i on top of the one already in use, but the ...

Article - Doug Sweetser - Jun 14 2011 - 8:21pm

Gravity is a Mystery (in words, no equations)

before the big bang. The future has a similar feel. The personal story ends for all reading this in ...

Blog Post - Doug Sweetser - Oct 29 2011 - 12:17pm

Self Replicating Robots- Safer For Galaxy (and Earth) Than Human Colonists- Is This Why ETs Didn't Colonize Earth?

century, you convert all the matter in the observable universe into humans within 18,000 years. (Here I say ...

Article - Robert Walker - Oct 29 2015 - 11:34am

No Simple Genetic Test To Separate Earth From Mars Life- Zubrin's Argument Examined

backbones. So to date, 70% of the archaea phyla have no cultivated "species" at all, and around 39% ...

Article - Robert Walker - Mar 11 2016 - 12:19pm

Puzzle: Which Tank Fills First? What Happens If You Increase The Flow Rate? Someone Tried- With A 3D Printer

Finally μ is the  dynamic viscosity All of those are constant (the pipes are all the same radius, and the ...

Article - Robert Walker - Aug 9 2017 - 11:48pm

The Probability Density Function: A Known Unknown

for all x>0. There exist more functional forms that are valid PDFs than stars in our universe, so ...

Article - Tommaso Dorigo - Mar 19 2025 - 11:44am

Is It True That An Asteroid Will Strike Earth On [Insert Date Here]?- Truth Behind Asteroid Scare Stories

asteroid that will hit the Earth as we are hit by meter scale objects all the time.  You usually get these ...

Article - Robert Walker - Sep 22 2015 - 6:07pm

Physical Reality: Less Is More

that a total of four out of the seven base units are spurious. In SI, all that is needed to measure ...

Article - Johannes Koelman - Oct 26 2010 - 10:54am

Snarky Puzzle Answers 2

4.4 form the foundation of all concepts presented in this book I had found errors of omission in those ...

Blog Post - Doug Sweetser - May 25 2011 - 12:12pm

Top 10 Scientific Uses For Leftover Halloween Candy

efficiency of the shape of M&M’s. M&M’s are one of my all-time favorite candies. Their colorful, ...

Article - Kimberly Crandell - Oct 31 2017 - 1:22pm