Fossils of the South African hominids Australopithecus sediba and Homo naledi are on display at the Perot Museum of Science and History in Dallas.
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The annual competition highlights the wonders to be found when scientists and photographers zoom in on the world around us.
Piranhas and pacus both lose and replace all teeth on one side of their mouths in one go, which may help to distribute wear and tear.
Born 100 years ago, Julia Robinson played a key role in solving Hilbert’s 10th problem.