Science correspondent Siouxsie Wiles looks at how an improved supercooling method could extend the life of donated organs by a day, the genetic mutation that makes people feel rested on just six hours sleep and how Toxoplasma gondii is a successful parasite that infects nearly a third of humans - now researchers have figured out how the parasite knows it's in a cat and not another mammal so it can perpetuate its life cycle.
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