Researchers studying verbal aggressiveness think they may have found a way to track the trait all the way back to the womb. A study by scientists at the University of Buffalo claims to have found a link between verbal aggression and a person's 2D:4D ratio -- a comparison of the length of index and ring finger that can offer insight into levels of testosterone exposure in the womb. The result could be a system for learning whose first instinct is to the tell people to "Come at me, bro," at a very young age.

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