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The release of the World Health Organisation's list of HIV drugs that meet its quality standards has sparked controversy about pricing. A fossil from Ethiopia – a million-year-old skull cap from Homo erectus – might mean redrawing our family tree. How much does a leopard eat for lunch? Scientists regard the break-up of the Antarctic Larsen B ice shelf as a result of climate change. In pursuit of the wandering North Magnetic Pole, which moves at about 40km per year.