Where did turtles come from? And how did the they get their shells? The answers to these questions caused scientists to rethink the entire history of reptile evolution.
A new study on the 2017 quake that killed 300 in Mexico City finds that both its location and cause were unusual. But seismologists say it could happen again.
A new study projects increases in burning across the U.S. West and Canada. It suggests large fires - such those we've seen recently in California - may become more common.