Unlike human brains, chimpanzee brains don’t get smaller as they age, suggesting that pronounced neurological decline is a uniquely human byproduct of our oversized brains and extreme longevity.
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Eleanor Simpson, a neuroscientist at Columbia University Medical Center, discusses a recent Nature paper that probes dopamine's role in helping animals make positive associations to stimuli that herald pleasurable outcomes (such as the handing out of food).
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In addition to its relationship to a variety of diseases, the length ratio of the second and fourth fingers also correlates with stretched penile length in men.
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