TRC #730: How Old Are Sharks? + Jim Carrey: Clone, Doppleganger or Mask?

Sharks are so old. How old are they? They're so old that you'll be shocked to hear of all of the things that haven't been on earth as long as sharks. Darren gives us a unique history of the earth by exploring the ages of very old things and contrasting them to the very long time that sharks have been around. Adam looks at a recent appearance of Jim Carrey that has fans wondering if he's been replaced with a clone, a double or a makeup artist in an elaborate mask.