Solving the Nerd-Sniping Problem: When Electronics meets Heat!
I recently stumbled upon this exciting problem from XKCD, aptly named as the Nerd-Sniping Problem: True to its name, it successfully managed to derail me from whatever it was that I was doing. The problem itself is quite curious, we have to find resistance between two points in an infinite lattice of ideal 1-ohm resistors.
Source: praveshkoirala.com