Just a few days in orbit can cause immune-cell disruption, dehydration and cloudy thinking - but most of these conditions revert to normal soon after travellers return to Earth.
This is the beginning of precision medicine for spaceflight.
DNA analysis of 475 ancient horses shows that horse domestication for transportation occurred 4,200 years ago, later than previously thought.
Chains of certain amino acids spontaneously form a glass when mixed with water, having unique self-healing properties, acting as a strong adhesive.
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