Last season, 60 Minutes witnessed the migration of monarch butterflies. Scientists are now using tiny, solar-powered radio tags to track individual butterflies and learn more about their migration.

Add Yahoo as a preferred source to see more of our stories on Google. In the predawn darkness, a team of scientists climbed the slope of Mexico's Popocatépetl volcano, one of the world’s most active ...

Scientists are flocking to Iceland to investigate an increasingly crucial question: Will melting glaciers accelerate and intensify earthquakes and volcanic eruptions? William Brangham reports. PBS ...