Tech & Science

A monster tornado destroys the town of Manchester, South Dakota, then churns across the countryside. Roger Hill and gang move in for a close look as it crosses the road.

Discovery of a huge unseen ring around Saturn, with a tantalizing analogy to the land of Mordor in "The Lord of the Rings." From the Spitzer Space Telescope series "Hidden Universe."

Beautiful space weather from the Cassini spacecraft, from NASA/JPL.