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Dutch and Austrian researchers found that an increase in this potent hormone led to shrinkage in key areas of the female (transitioning to male) brain associated with language.
So, having testosterone makes you less chatty? Groundbreaking...
A linked study in the article:
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Hoffman and an interpreter went to eight villages, some Khasi and some Karbi, and recruited 1,279 volunteers to complete a four-piece puzzle of a horse while being timed. All of the volunteers got a day's wages just for showing up; to motivate them, Hoffman offered another fifth of a day's wages if they completed the puzzle in less than 30 seconds.
The average was around 40 seconds - no kidding. How can it take 40 seconds to solve a four piece puzzle?