Turn a female rat into a male by rubbing its tummy

US scientists found that mother rats spent many more hours licking and grooming male offspring than female ones. By tickling a baby female rat’s tummy for hours on end, the team from the University of Wisconsin managed to make the DNA clusters in its brain become more like a male’s. The research, reported in the New Scientist, challenges the long-accepted belief that the physical differences between a male and female brain are genetic.

(via Althouse)

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