A woman discovered a rare shark tooth in Florida, offering a glimpse into prehistoric times. Nichole Mercuri, 26, was walking along a Florida beach when she says she spotted a giant tooth that ...

The 6.25-inch long megalodon tooth is the largest prehistoric shark tooth diver Michael Nastasio has found in his 22 years of diving.

Did the "Meg" ever live in Arizona? Valley 101 podcasters enter ancient seas to discover Arizona's rich shark history.