You probably know that sweatier feet are stinkier feet, but it's not just sweat that creates smelly toes. In fact, on its own, sweat is odorless. But the moisture contributes to an environment prime for bacteria that feed on your dead foot skin and secrete a series of smelly gases.
This video from Reactions breaks down the chemical reactions behind those rancid gym shoes and provides a scientific solution for combating this pesky problem.
[h/t Laughing Squid]