Now the astronauts have arrived home, they will soon be taken to the Johnson Space Centre in Houston, Texas, where they will be checked over by medical experts.
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Madeleine Finlay sits down with science editor Ian Sample and science correspondent Nicola Davis to discuss three eye-catching stories, including the impact of a powerful psychedelic on depression, answers on the death of Russian opposition leader Alexei Navalny, and an explanation to the mystery of why humans have chins
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