Science

When The Earth Swallows

Last week a Florida man was swallowed by the Earth as he slept, the victim of a sinkhole. In 1981, another Florida sinkhole ate a swimming pool and a Porsche repair shop. Randall Orndorff, a geologist for the U.S. Geological Survey, discusses this mysterious phenomenon, and whether technology exists to predict when--and where--the surface might crumble.

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.