Physicists Have Argued Over This Problem Since 1883. It May Now Be Solved.

For more than a century, physicists debated which way a submerged sprinkler sucking in water would spin. Careful experiments ...

Solution to Feynman’s reverse sprinkler puzzle also applies to “silly sprinklers”

Researchers at New York University’s Courant Institute conducted a series of experiments with different silly sprinkler ...
Scientific American

Mathematicians still don’t know the fastest way to multiply numbers

This requires an algorithm: students are taught to stack one number atop another and multiply each digit of the bottom number ...