These NASA satellite photos from September 2010 and March 2011 show the contrast in the appearance of Japan's coastline, before and after the March 11 tsunami.
Arjun Makhijani studies shows how the U.S. could have low-carbon energy. He believes wind and solar energy would be cheaper and safer than nuclear power.
Organic farmers use their understanding of natural processes to optimize crop yields. The surprising results make you wonder where to draw the line between technology and nature.