So what does it mean to be a woman? We all have XX chromosomes, right?

Actually, that's not true. Some women are mosaics.

They have a mix of chromosome types with X, with XY or with XXX. If it's not just about our chromosomes,

then what is being a woman about? Being feminine?

Getting married? Having kids?

You don't have to look far to find fantastic exceptions to these rules,

but we all share something that makes us women. Maybe that something is in our brains.

You might have heard theories from last century about how men are better at math than women

because they have bigger brains. These theories have been debunked.

The average man has a brain about three times smaller than the average elephant,