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Songbirds appear to have evolved through rare explosions of change separated by long periods of slower development. Many of those bursts lined up with major climate shifts, suggesting that environmental upheaval can reshape life in powerful ways.

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The viral 2010 power posing study claimed two minutes of an expansive stance changes testosterone and cortisol, but a 2015 replication with five times as many participants found no such hormonal effect at all

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