Brady Barr's Dangerous Encounter With the 'Jurassic Shark'

Scientist-adventurer Brady Barr has traveled all over the world to study hundreds of animal species, but a recent trip took him somewhere few people have ever been -- to see one of the world's most mysterious, and some believe one of the oldest living creatures. Call it the "Jurassic shark." The six-gill shark is one of the least understood sharks in the world, Barr said. That's because the six-gill lives thousands of feet below the ocean's surface in frigid, pitch-black waters and almost... Full Story