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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Human rights groups have accused both the rebels and state forces of committing widespread abuses.

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Harriet BradshawScience reporter

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有许多人生滋味,非亲历而不能体会。少年心思坦然,只晓得过节能有美食大餐,可以玩耍嬉戏,没有多少烦恼,一心只想往前飞。到了一定年龄,方能体会葛天民那两首跟元宵节有关的诗——“佳节无如元夕盛,老怀不似少年豪”的感慨,以及“元宵有月更无愁,已是新年第一筹”的不易和悠游。