So in some sense, alien worlds were not first discovered in the 1990s or even the 1980s. It took nearly a century to fully ...
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Scientists redid an experiment that showed how life on Earth could have started. They found a new possibilityNew research suggests “microlightning” exchanges among water droplets in Earth’s early atmosphere may have sparked the building blocks of life.
Sharp stone technology chipped over three million years allowed early humans to exploit animal and plant food resources. But how did the production of stone tools -- called 'knapping' -- start?
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