Nurture vs Nature. Are Boys Born Boys and Girls Born Girls?

In the 1960's the rise of Feminism pushed the question:

Are we brainwashing girls to be feminine and boys to be masculine?

It became very poplar and politically correct to give boys dolls and girls trucks or at least have both types of toys available for children.

A friend of mine, raised in very PC California, worked in an infant to three years old day care center. She religiously made sure that both types of toys were available for all the kids. Inevitably the boys played with the trucks and tools and the girls played with the dolls and kitchen equipment.

My grandson has two, not all that much, older big sisters, so there are plenty of dolls and all the feminine paraphernalia and accessories available. He loves cars, trucks and trains. He'll break a crayon, put one piece in front of the other and shout:

"Too- too!"

And he'll push his little "train" around the room. Today when we were out, he was overjoyed to see a bus, pointed and shouted:

"Autobus! Autobus!" the Hebrew for bus.

His sisters had different interests at that age.