Prehistoric Sharks with Dr. Kammerer

Let's go back in time, to a time where prehistoric sharks swam the ocean, some with a spiral of bottom teeth, some with bony protrusions off the top of their head, and one that was 30 times larger than a Great White Shark!  We sit down with Dr. Christian Kammerer from the Museum of Natural Sciences and pick his brain about all the wonderful and wondrous prehistoric sharks that lived in the ocean well before our time.