The waters off British Columbia, Canada, are littered with dead starfish, and researchers have no idea what’s causing the deaths. At the end of August, marine biologist and scuba enthusiast Jonathan Martin was out on his usual Saturday dive with some friends when he noticed something unusual. “We just started noticing dead starfish that looked like...

The waters off British Columbia, Canada, are littered with dead starfish, and researchers have no idea what’s causing the deaths. At the end of August, marine biologist and scuba enthusiast Jonathan Martin was out on his usual Saturday dive with some friends when he noticed something unusual. “We just started noticing dead starfish that looked like...