- Scott and Mark Kelly are identical twins with two sets of the same DNA.
- While Scott spent a year in space, his brother Mark stayed on Earth, giving NASA a unique opportunity to see how space flight changes the human body and brain.
- They’re uncovering some fascinating results: about 7% of Scott Kelly’s DNA may have permanently changed in space.
When NASA astronaut Scott Kelly stood up last March after spending a year in space, he was two inches taller.
The engineer and veteran of four space flights is part of a long-term NASA study that aims to figure out how being in space changes our bodies and brains.See the rest of the story at Business Insider
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