Hurricane Ivan was photographed as it churned in the Gulf of Mexico late on Sept. 14 by astronaut Edward M. (Mike) Fincke aboard the International Space Station, 230 miles above Earth. File photo hide caption

itoggle caption File photo

Environmental Engineering graduate student Daniel Tkacik (right) and engineer David Van Gilst analyze the composition of air samples sucked in from outside the plane. NASA hide caption

itoggle caption NASA

A group of chimpanzees in Mfou National Park, Cameroon. For the study, researchers analyzed the blood and tissue samples of nearly 100 chimps from Cameroon and Ivory Coast. Nathan Wolfe/Global Viral Forecasting Initiative hide caption

itoggle caption Nathan Wolfe/Global Viral Forecasting Initiative