National Geographic diver Mark Addison has been swimming with sharks for nearly 20 years now, and runs a consulting company that assists in underwater science operations, filming, and photography. 

In this edition of Presentation of the Day (from PKN Durban, Vol. 8), Mark insists that "no shark is a bad shark." He's out to change the conceptions of fear and misunderstanding surrounding these apex predators (the same classification that Humans belong to), and he's hoping his daughter, Ella -- along with her generation -- can work to minimize human impact on these animals.

You can see a bit more of Mark and his crew on the National Geographic TV show "Shark Attack Experiment".