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Two Key Things Astronaut Scott Kelly's Body Will Teach Us About Living in Space

We’re all looking forward to interstellar travel and colonizing Mars, but first, we’ve got a lot to learn about how the human body responds to the cold dark void of outer space. Scott Kelly’s stint on the ISS, which ends tomorrow, is helping us answer some critical questions—including what weightlessness does to our…

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The UN’s New Report on Asian Teenagers and HIV Is Just Heart-Breaking

We’re making progress in the fight against HIV around the world, but it’s still very unevenly distributed. And the United Nations’ brand new report on HIV infections among teenagers in Asia is pretty upsetting. Some 50,000 Asian teens (aged 15-19) became HIV-positive in 2014 alone, and a total of 220,000 adolescents…