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by TravelAndFood 2445 days ago
I assumed, past tense, that it was integral, and with this new information I realize it is not integral, and now I'm curious about it.

(technically: I never heard anyone say they could not do this until now, but I have heard people say they CAN do this (including me). So as far as I knew all my N sample size of humans was positive for this, or at least not negative, previously indicating to me that the ability is "integral" to being human.)