Why Don’t Sharks Have Bones?

Eat facts, Shark Week! Hank takes you on a tour of the shark’s amazing anatomy, including the many adaptations that made it a great predator — despite not having any bones.
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Hank Green – Executive Producer / Host / Writer
Blake De Pastino – Chief Editor
Caitlin Hofmeister – Producer
Stefan Chin – Graphics
Louey Winkler – Camera
Sarah Meismer – Editor
Michael Aranda – Script Supervisor

The Mechanical Behavior of Shark Skin – http://www.ias.ac.in/jarch/jbiosci/22/431-437.pdf
Importance of Cartilage – http://www.elasmo-research.org/education/topics/p_cartilage.htm
FISH TO TETRAPODS – http://en.wikipedia.org/wiki/Evolution_of_fish#Fish_to_tetrapods
Leydig’s Organ – http://en.wikipedia.org/wiki/Leydig%27s_organ
Chondrychthyes – http://en.wikipedia.org/wiki/Chondrichthyes
Osteichthyes – http://en.wikipedia.org/wiki/Osteichthyes
Evolution of Fish – http://en.wikipedia.org/wiki/Evolution_of_fish