[ad_1] We have comets and asteroids to thank for Earth’s water, according to the most widely-held theory among scientists. But it’s not that cut-and-dried. It’s still a bit of a mystery, and …
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[ad_1] The total fertility rate — or the average number of children a woman would have if she lived through all her reproductive years — declined from 4.7 live births in 1950 …
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[ad_1] An MIT study proposes that laser technology on Earth could emit a beacon strong enough to attract attention from as far as 20,000 light years away. Credit: MIT News If extraterrestrial …
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