Science

Curiosity Hits Paydirt: New Clues To Life On Mars

Microbes may once have happily existed on the surface of Mars, according to chemical analysis of a sedimentary rock in the Red Planet's Gale crater. NASA geologist and exobiologist David Blake discusses evidence for an ancient freshwater lake in the crater, and describes the mineral-chomping microbes that may have thrived there.

Scientists Make Plans To Blast Threatening Asteroids

The recent meteor blast in Russia has brought renewed attention to the risk posed by meteors on a collision course with Earth. NASA and the European Space Agency are working on a plan to develop a rocket that could collide with an asteroid and knock it off course. Dr. Andrew Cheng of the John Hopkins Applied Physics Lab, who is leading the initiative, talks about it with host Jacki Lyden.