Stop giving girls dolls to play with and give them a toy that requires them to think more.

actually the first toys i remember are dolls that i inherited from my cousin sister. Didn't help though - top math/physics grades through school, regional math/physics competitions 2nd place, math department at one of the top Russian universities (dropped from PhD at the end), and programmer for the last 2 decades. Left brained to the point of moronism. (My father about the same. His single mother couldn't afford nor legos nor dolls, pretty much nothing. And from what little i know about my grand-dad on this side - his left brain ruled like crazy too).