Cities at night learning about cities from a different perspective

By now you've probably seen the new Earth at Night images and videos from NASA . Chris Elvidge, a NOAA scientist who has studied the Earth at night for over 20 years (talk about an awesome job!) says, "Nothing tells us more about the spread of humans across the Earth than city lights."http://www.youtube.com/watch?v=T0951bDyu9g [More]