Structurally the brain has two hemispheres- the right and the left ones. These are connected by a thick band of nerves called the corpus callosum.
This band is slightly thicker in women than in men; meaning that the emotional side of the brain is in better co-ordination with the practical left side of the brain. The book says that this is the reason why women are more emotional and cry more than men.
Source: Medindia
RAS