Science, Tech & Environment

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Eric Stroud tests chemical shark repellent (Photo: Chinwa Fakhri Choueiter)

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    Eric Stroud displays a magnetized mix of two rare earth metals -- neodymium and praseodymium -- that he has found to be highly effective at repelling sharks. (Photo: Ghinwa Fakhri Choueiter)

  • captiveLemonShark02.jpg

    Field assistant T. J. Ostendorf holds a lemon shark in a seaside pen at Bimini Biological Field Station. The shark is turned upside down to induce a sleep-like state called tonic immobility. A repellent is considered effective if it can rouse a shark from

  • smarthook.jpg

    This SharkDefense SMART Hook is magnetized and wrapped with a magnesium alloy foil to repel sharks. (Photo: Eric Stroud)

  • Shark-header.jpg

    Field assistant T. J. Ostendorf holds a lemon shark in a seaside pen at Bimini Biological Field Station. (Photo: Ghinwa Fakhri Choueiter)