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Why does your body clock change with age?
It's well known that teenagers' body clocks seem to run on a different time from adults'. But is that true, and if so, why?
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Why can't teenagers get up in the morning?
Duration: 02:19
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Which type of exercise gives you the strongest bones?
Duration: 01:53
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Michael Mosley puts Tai Chi to the test—Series 8, Episode 6
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