You may not even know you have one.

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Extreme weather triggered a tragedy.

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The evidence is accumulating.

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And we can modify them.

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A controversial approach.

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There's so much we still don't understand.

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A radical new treatment may be emerging.

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Could they save lives?

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A concerning trend is emerging.

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But there's a catch.

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Could this be a new way to treat it?

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But the changes could be reversible.

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