If you want to replicate the effects of weightlessness you could send various objects and animals into the sky aboard the Vomit Comet or you could just haul them to the top of a 475-foot-tall tower and let them drop. At Gizmodo India, Geoff Manaugh writes about the tower in Germany where scientists go see what happens when you drop a lead weight, or a billiard ball … or a fish.