Archaeologists say the motivation is "very difficult to interpret".

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Long before buboes.

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'The Hum' has been one of the most perplexing unsolved mysteries.

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Here's what's known so far.

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This could help a lot of people.

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He has a lot to say when given the opportunity.

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If aliens are not here, are they out there?

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"It's not a misconception."

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A potential treatment for millions.

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What went on here?

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"Understanding the function of this neurotransmitter is essential."

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This butterfly lives up to 25 times longer than its relatives.

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Don't catch those raindrops on your tongue.

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It's important to get the full story.

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Pets could affect mood in ways scientists didn't expect.

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Here's how to see it.

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They could do more than feel cool.

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You may not even know you have one.

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A social sync.

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The heads are nowhere to be found.

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