Well, if it helps, there must be /some/ ferrous impurities in that lead. Also, to be fair, Pb is weakly diamagnetic, so it is very weakly /repulsed/ by the same magnetic field that would attract a ferrous material. Apparently, Magneto has dominion over para- and diamagnetic materials too! Cheers

Topologist: The cup is a torus.

Yes! Momentum conservation pushes the boat backwards the instant the cannon is fired.

Worked great for me, thanks!

My guess: A single (free) hydrogen atom in its ground state. The electron cloud must be spherically symmetric (as the Coulomb force is central)

One can go see this anchor at the Dossin Great Lakes Museum on Belle Isle! Cheers

Hi! Here's my university's directory page for me. Thanks!
wayne.edu/people/fr4526

Sure, lots of devices can heat or cool air. Here's the most efficient writeup i could find showing that even vortex tubes respect the 2nd law. cheers
www.webpages.uidaho.edu/mindworks/Th...

It can't, because the 2nd law of thermodynamics is true. Maxwell's Demon is a sort of thought-experiment example of what a second-law-violating process could look like microscopically. cheers

Signed!

I just like doing things like that!

Kilroy is there

Just one jet? Shouldn’t there be another, pointing in the opposite direction? Gorgeous pic, thanks for sharing!

Angular momentum

So's straka

It was a "shank." His loopy swing missed the ball by so much that what struck the ball was the hosel (the end of the club shaft). Epic fail

After one, tigers 6, rockies 0