NASA's GRAIL mission to study the moon launches aboard a Delta II rocket at Kennedy Space Center on Sept. 10. Sandra Joseph and Don Kight/NASA hide caption

itoggle caption Sandra Joseph and Don Kight/NASA

A Swainson's thrush flies a mock-migration in the wind tunnel at the University of Western Ontario. Science/AAAS hide caption

itoggle caption Science/AAAS

Does getting home from your vacation spot always seem to take less time than getting there? A new scientific study provides an explanation for why. Harold M. Lambert/Lambert/Getty Images hide caption

itoggle caption Harold M. Lambert/Lambert/Getty Images

Researchers hope to keep the mosquito that transmits dengue, Aedes aegypti, from infecting humans using the Wolbachia bacterium. James Gathany/CDC Public Health Image Library hide caption

itoggle caption James Gathany/CDC Public Health Image Library

Scientists now know why coffee rings have dark, well-defined edges, as seen in the image above. The research finding may have implications on the development of inks and paints. Marina Dominguez/NPR hide caption

itoggle caption Marina Dominguez/NPR

The Juno spacecraft, seen above Jupiter in this artist's rendering. Juno's primary mission is to improve our understanding of Jupiter's formation and evolution. NASA/JPL-Caltech hide caption

itoggle caption NASA/JPL-Caltech

Vampire bats have the ability to detect heat in their surroundings. This enables them to home in on animals that have blood vessels near the surface of their bodies. This vampire bat was caught in a net for a research study in Para, Brazil, in 2005. Mario Quadros/AP hide caption

itoggle caption Mario Quadros/AP