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Long-duration missions in space take a toll on the body, astronauts lose bone density and suffer muscle loss. Blood circulation is also affected, and fluid shifts can also impact eyesight.
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"I think the hand is the hardest, most complex part of any humanoid robot," says Bren Pierce, the founder of robotics start-up, Kinisi, based in Bristol.
However, family members can veto their loved one's wishes to donate their organs after their death, even if they had signed up to the organ donor register.