Friday links

by Debby Witt

Picking your soulmate and picking the cleanest toilet at a public event in the fewest tries have the same optimal solution.

Having frequent diarrhea as a child shapes your adult mate choice.

If the French monarchy were restored, this guy would become King Louis XX of France.

From the archives: ten things dogs hate about humans.

The never-ending conundrums of 19th-century classical physics brainteasers.

During WWI, the War Department sent American artists to Europe. The Smithsonian recently digitized this artwork from the front lines, which has gone largely unseen for decades. 

ICYMI, Tuesday’s links are here and include lots of Schrödinger’s cat stuff, the science of spiders on drugs, and medieval knights vs. modern troops.