A new study shows that exposure to two specific 'forever chemicals' may accelerate biological aging, especially in middle-aged men. Researchers revealed a link between faster epigenetic aging, and two of these alternatives, PFNA and PFOSA, a precursor of PFOA.

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She says she has no regrets about bringing her astronaut career to an end. She made her decision and didn't look back. But there's still a wistful look in her eye when we ask if she'd be tempted if a seat on a spacecraft became free.

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莫納漢(Monaghan)解釋,這類實驗性研究的目的,是了解人們如何在一門語言中逐漸站穩腳步。

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