When NASA set out to study identical twin astronauts, leaving one on Earth and sending the other to the International Space Station (ISS) for a year, they expected that the rigours of microgravity would have largely negative impacts.
But on board the ISS, Scott Kelly, 51, underwent a very strange transformation which has left scientists scratching their heads.
The telomeres in his white blood cells got longer. Telomeres are the protective caps which sit at the end of chromosomes, protecting the DNA inside, like the plastic aglets on the end of shoelaces.
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