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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