AUDIE CORNISH, HOST:
Scientists on an expedition off the coast of Alaska found something they had long thought was impossible. Beneath two, three, even four feet of ice in the frozen Chukchi Sea, they found algae. Not just a little but a bloom that ran at least 60 miles wide. The team just published its findings in the journal Science.
Here to tell us why it's a big deal is the man who led the expedition, Kevin Arrigo, professor of environmental earth systems science at Stanford University. Professor Arrigo, thanks for talking with us.