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"Junk DNA" might account for why the differences between humans and chimpanzees are so great, even though we share around 98% of our DNA. What is a planet – and should our solar system number 9, 12 or even more of them? International effort to identify the remains of 48 Chileans murdered under the Pinochet regime who were mis-identified identified in 1991. An appreciation of the achievements of astrophysicist James Van Allen – "first scientist of the space age" – who has died aged 91. Plus, can elephants run?