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AstronomyStarry View: Image reveals galaxy’s violent past
The most detailed visible-light picture ever taken of the heavens reveals that the nearby Andromeda galaxy has had a much more violent history than our own Milky Way has.
By Ron Cowen -
AnthropologyAncestral split in Africa, China
Environmental conditions may have encouraged Homo erectus to develop a level of social and tool-making complexity in Africa that the same species did not achieve in China.
By Bruce Bower -
AnthropologyWari skulls create trophy-head mystery
A 1,000-year-old Peruvian site has yielded the remains of decapitated human heads that were used as ritual trophies but, to the researchers surprise, did not come from enemy warriors.