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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* Write a detailed test suite as you add more features. The test must be re-executed at every major change.

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Polly Toynbee is a Guardian columnist

let list of candidates = N closest colours to pixel

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