This graph of Boulder's year-to-date rainfall is just staggering

In Colorado, rainfall characterized by the National Weather Service as "biblical" has left thousands homeless, hundreds missing and at least eight people dead. Among the hardest-hit cities has been Boulder, which last week catapulted from a dry spell into its wettest year on record in the span of just five days. » 9/18/13 10:40am 9/18/13 10:40am

The Mysterious Rubbing Rocks of the Atacama Desert

South America's Atacama Desert gets less than a millimeter of rain a year, and some areas have probably never received rainfall. Yet there are rocks in the desert that seem to have been eroded by water. What's going on here? » 10/11/11 11:40am 10/11/11 11:40am