Of the over 100,000 people on the waitlist for an organ in the United States, 17 die every day. Now, the first pig-to-human heart transplant reveals some of the challenges of xenotransplantation.
(This program is no longer available for online streaming.) From lobster claws and dog teeth to bee stings and snake fangs, every creature depends on a weapon. But some are armed to extremes that make ...
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