Longer life expectancy can’t explain it all.

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But the changes could be reversible.

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A tempestuous relationship.

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What does it mean to be alive?

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"This is a case of ongoing natural selection."

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A hidden trick.

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It's the best explanation we've got.

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There's another factor that may matter more.

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Lower weight and a brain boost?

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"It does not appear to be simply about the inflammatory response alone."

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A tragic irony.

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Our weekly science news roundup.

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