Host Jeff "JJ" Johnson reveals the stories behind why manhole covers are round, the creation of the teddy bear, what it means to be in the limelight, the invention of elevator brakes, the Wiffle ball, safety pins, the sandwich, the piggy bank, and the Slinky. Plus, learn how Times Square got its name and what liquid is best to cool ones tongue when eating spicy food. Part of the "Wow! I Never Knew That!" series.