Can building exteriors really eat smog in cities like Los Angeles, pictured here? iStockphoto.com hide caption
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Thursday
An image believed to be that of a hole-punch cloud. Scientists say airplanes create these patterns when they fly through certain types of clouds. The water in the clouds can turn to rain or snow and fall to the ground. H. Raab/Vesta/Wikimedia Commons hide caption
Wednesday
Monday
Onlookers crowd around their cars in the NASA causeway as they watch the US Space Shuttle Atlantis blast off into orbit from launch pad 39-B at Kennedy Space Center in the early morning hours of July 12 2001. Brian Cleary/AFP/Getty Images hide caption
"Rollin Justin" the robot. German Aerospace Center hide caption
Dr. Mark Lachs says his older patients are like reliable cars. After a certain age, they are less likely to break down, and just keep rolling right along. Adrian Kinloch hide caption
Dr. Ray Dorsey video chats with his patient, Victor Jarzombeck, from his office at Johns Hopkins Medical Center in Baltimore. Dorsey has been treating Jarzombeck, who lives nearly 350 miles away in New Hartford, N.Y., for three years. Maggie Starbard/NPR hide caption