There is something about sharks that bring out our inner fears. It is likely their teeth or their black eyes that are shown in scary movies and nature films that send chills down our back. But these animals have an important role in the health of our oceans. With over 500 species of sharks, there is a lot to be learned about them - like some of them do not have any teeth. Dr. Biology catches up with James Sulikowski, a biologist and shark expert. The two talk about what we know and don’t know about these amazing animals.