Unless there's a serious pileup, ants in traffic tend to bypass a collision and just keep going. A physicist has found a way to model this behavior with a mathematical equation. iStockphoto hide caption

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Larkin Carey, an optical engineer with Ball Aerospace, examines two test mirror segments designed for the James Webb Space Telescope. The mirror for the scope is extremely powerful, but heavy and pricey. NASA hide caption

itoggle caption NASA

A blast from the past: Using data from four telescopes, NASA created this image of the first documented sighting of a supernova, made by Chinese astronomers in 185 A.D. NASA/JPL-Caltech/B. Williams hide caption

itoggle caption NASA/JPL-Caltech/B. Williams

Norma Melendez, a community health worker with City Health Works, walks along Second Avenue on her way to meet a client. City Health Works is an organization that is attempting to bring an African model of health care delivery to the United States. Bryan Thomas for NPR hide caption

itoggle caption Bryan Thomas for NPR

Researchers at Cold Spring Harbor Laboratory say their new genetic toolkit to improve tomato yield without compromising flavor can be used in all varieties, from plum to cherry. Courtesy of Zach Lippman/Cold Spring Harbor Laboratory hide caption

itoggle caption Courtesy of Zach Lippman/Cold Spring Harbor Laboratory

Jennifer Doudna and her colleagues found an enzyme in bacteria that makes editing DNA in animal cells much easier. Cailey Cotner/UC Berkeley hide caption

itoggle caption Cailey Cotner/UC Berkeley