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.

· · 来源:tutorial资讯

As navigator, Lovell took with him a sextant to take star readings - in case the computers failed and they had to find their own way home.

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