A satellite image shows a field of what may be buried pyramid sites in Egypt. Courtesy of DigitalGlobe Images hide caption

itoggle caption Courtesy of DigitalGlobe Images

Shoppers crowd a narrow street outside Tsukiji market in Tokyo on Dec. 31, 2010. Japan has relatively tight social rules. And that makes sense, according to researchers. When people are squeezed together, they have an incentive to cooperate. Toru Yamanaka/AFP/Getty Images hide caption

itoggle caption Toru Yamanaka/AFP/Getty Images

Learning juicy details about someone can change the way you see them — literally, according to a new study. August Darwell/Getty Images hide caption

itoggle caption August Darwell/Getty Images

A patient participates in a brain-computer interface study. By placing an array of sensors directly on the brain and connecting them to a computer, researchers are able to decode brain signals into meaningful information, including some words. American Museum of Natural History Science Bulletins hide caption

itoggle caption American Museum of Natural History Science Bulletins