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[Music]

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[Applause]

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when i was four i told my mother i was

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going to be an astronaut so it's kind of

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being a perpetual thing from there and i

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figure if i'm going to be an astronaut i

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don't want to be getting sick

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and if someone isn't doing what i think

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about the immune system why don't i go

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look at it myself this is the mini pcr

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machine designed by mini pcr

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pcr is polymerase chain reaction

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so dna amplification we now have more

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dna amplification capabilities on the

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station but when this went up it was the

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first

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hi this is tim peake on board the

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international space station and this is

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a message to anna sophia to say a huge

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congratulations for your willing

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submission to investigate the effects of

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cosmic radiation and microgravity on the

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body's immune system so you're meant to

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have a balanced ratio of your t helper

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one and two for two cells but when

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you're in space you get a much more

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dominant t helper two phenotype which

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decreases your cell-mediated immunity

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and just generally hampers your immune

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system