And yet, I read a study where they codified how to tell if a brain was male or female. first time they tried, they got a better than 70% accuracy. After reviewing and updating their method, they taught this to other scientist who tried to identify the brain whether it was male or female, and were able to tell the sex of the person with 90+% accuracy.
It was the first of its kind and hasn't been repeated because its "damaging"
First clue is size. Male brains are bigger on average. That's cold hard fact. Try putting on your girlfriend's/wife's hat. Chances are it's too small.
Edit: also bigger/denser bones. But my point still stands. My hat falls down under its own weight to my GF's eye level.
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