Humans have a specific immune system. We have to be exposed to a disease before we can form the specific antibody to fight that disease. Sharks, unlike most animals, can heal a torn cornea. Shark corneas contain both rods and cones and could be used for transplant to humans. Sharks can also heal major wounds in short periods of time, often in 24 hours.
Sharks have a resistance to cancer.
Study of this natural resistance may help researchers to find cures for human cancers. Shark cartilage pills, however, have not been been proven to be an effective cancer treatment, says Dr. Carl Luer of Mote Marine Laboratory . The risk of being attacked by a shark is less than the risk of being struck by lightning. However, humans are the leading cause of death for sharks. Best of all, sharks are just plain cool.