How do beach volleyball players manage to avoid the billions of granules of sand that cover their sport's playing surface? Because it's not the same sand that gets between your toes when you go on vacation.

The sand used in competition is heavily regulated by the International Volleyball Federation. There are no pebbles or bits of shells. The shape ensures a smoother grain. The size is Goldilocks style: not too small or too big. Why doesn't it stick? Because it's designed not to.