Farmers ride in their tractor in the drought-hit region of Hasaka in northeastern Syria on June 17, 2010. Louai Beshara/AFP/Getty Images hide caption

Feral hogs were once just a rural problem in Texas, but now they threaten to turn city parks into sties. Courtesy City Trapping hide caption

Mated pairs of red-crowned cranes perform a "unison call," a complex and extended series of calls between the male and female that reinforces the pair bond. Sture Traneving hide caption

An aerial view of Memorial Medical Center surrounded by floodwaters on Sept. 9, 2005. Kathy Anderson/The Times-Picayune/Landov hide caption

Members of S. A. Andrée's 1897 journey survey their downed vessel. This photo was recovered from a camera when their remains were found 33 years later. Courtesy of Grenna Museum, Andréexpeditionen Polarcenter/Swedish Society for Anthropology and Geography/National Geographic hide caption

Caleb Burhans debut album as a composer is called Evensong. Courtesy of the artist hide caption