An American chemist says he's found a substance several, in fact, that can repel some of the most fearsome predators in the ocean, and he wants to use his discovery to protect them. Reporter Ari Daniel Shapiro of our partner program NOVA has the story.
Genetic tests allow doctors to diagnose disease, but the knowledge of what's in your DNA doesn't always help in the way one might hope. Reporter Ari Daniel Shapiro of our partner program NOVA has the story of one man and his unusual gene.
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