Bill Gates says a devastating 'quirk of nature' could kill 30 million people in a year. Researchers are fighting that threat by studying bird butts.

Migrating shorebirds stop each spring in New Jersey to feast on horseshoe-crab eggs. The birds havelots of flu strains in their guts. Researchers swab the…

Read More Bill Gates says a devastating 'quirk of nature' could kill 30 million people in a year. Researchers are fighting that threat by studying bird butts.