Twins show that genes play a significant role in how affectionate women are, but not guys. Plus, tips for how huggers can get through social distancing.
Tags: gender genes twins touch featured society-and-culture social-lives
Astronaut Scott Kelly spent 340 days in space. His twin brother, astronaut Mark Kelly, stayed on Earth. Here's how their mitochondria compare.
Tags: space mitochondria twins astronauts muscles featured health-and-medicine microgravity siblings
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