Longer life expectancy can’t explain it all.

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But the changes could be reversible.

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“We are just scratching the surface of what these neural cultures can achieve.”

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A tempestuous relationship.

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What does it mean to be alive?

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The meteor was traveling at 75,000 mph when it broke apart, NASA says.

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"I actually started crying."

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"This is a case of ongoing natural selection."

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