'Superhuman Animals': Woman Tests Shark Repellent In Shark-Infested Waters

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'Superhuman Animals': Woman Tests Shark Repellent In Shark-Infested Waters

On "Superhuman Animals," Dr. Helen Czerski dove into shark-infested waters using only a certain smell as her defense. "Their noses are detecting the minute chemical cues I give off as I move through the water," Dr. Czerski explains.

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Marine biologist Dr. Patrick Rice is also helping to develop the shark repelling scent called a necromone.

A necromone is a chemical signal that tells sharks there are other predators in the area. It's also the smell of dead shark, which is a sure sign for other sharks that danger is around. When sharks smell it, they are hard-wired to flee.

As Shark Defense.com notes, it's believed this is a response they've had since prehistoric times. It evolved at a time when sharks weren't top predators -- they were just little things in the big, bad sea. Imagine that.

To catch more episodes of "Superhuman Animals" you can tune in Tuesday nights at 8/7c on BBC America.

Speaking of sharks, have you ever seen the creepy 'cookiecutter'?
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'Superhuman Animals': Woman Tests Shark Repellent In Shark-Infested Waters
Cookie Cutter Shark
Mexico, Isla Guadalupe, California sea lion (Zalophus californianus), note the large round cookie cutter shark bite scar
Mexico, Isla Guadalupe, California sea lion (Zalophus californianus), note the large round cookie cutter shark bite scar
Mexico, Isla Guadalupe, California sea lion (Zalophus californianus), note the large round cookie cutter shark bite scar
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More to see:
Shark kills man in Australia despite rescue bid
Great white shark attacks two off coast of Massachusetts
Massive whale shark crashes into diver
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