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How Earth would change if aliens arrived a million years later

Scientists have pieced together a pretty clear picture of what life was like on Earth thousands, even millions of years ago.
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Maya civilization had 16 million people at peak, new study finds — twice the population of modern-day NYC

The Maya population during the civilization's peak 1,400 years ago may have been far larger than previously thought, new research reveals. The study also hints that Maya settlements at that time were ...