Does It Really Take Seven Years to Digest Swallowed Gum?

It takes seven years to digest swallowed gum. A penny placed on a train track can cause a train to derail. The average human consumes four spiders per year while sleeping. You may have heard some of these common sayings or beliefs before. But are they really true? Can they be proven using science? Let’s investigate seventeen statements about familiar items and everyday events and find out which on...