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Altitude doesn't just affect oxygen delivery in the blood, it also changes the drag affecting winter athletes.
A recently licensed type of emergency contraception may offer women protection from pregnancy even when taken five days after sex.
Scientists have produced hard evidence that self-awareness is a big problem for people with autism.
Men carry a gene that allows them to grow bigger than women, but limits their lifespan, research on mice suggests.
Daily limits on alcohol consumption devised by the government are unhelpful and potentially harmful, warn experts.