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FITNESS MATTERS

Low cortisol, hair-trigger stress response in the brain may underlie Long COVID

Proteins left behind by COVID-19 long after initial infection can cause cortisol levels in the brain to plummet, inflame the nervous system and prime...

How ‘winner and loser effects’ impact social rank in animals — and humans

Research has shown that in many animals, the winners of a fight are more likely to win subsequent contests, while the losers tend to...

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