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Physicists have long grappled with the question of why the universe was able to support the evolution of intelligent life.

When spring arrives, so do warnings about thunderstorm asthma. But a decade ago, most of us hadn’t heard of it. So where did ...

Earth's orbit is getting crowded with junk. And that's becoming a major problem.  Starting with Sputnik I in 1957, humanity has sent up nearly 17,000 satellites. Around 11,500 ...