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Multi-father families or partible paterity as practised by some tribal societies was a lead topic for anthropologisits at the recent American Association for the Advancement of Science (AAAS) meeting, with reports of higher survival rates for children with more fathers. The first Aids vaccine goes on trial in Africa, in Uganda, and has many volunteers. US scientists at University of Delaware develop a new way of predicting heatwaves which could save lives. Why ducks sleep with one eye open and half their brain awake and what that can tell us about sleep.