All of this is very interesting, but the reasons why these gender differences exist is far more exciting to me. There are several conjectures, but the one that grated especially hard was the one from Emily Chiang, an investment advisor, who thinks that "evolutionary psychology" is responsible for the gap:
"Men are hunters, she said. "Women are more like gatherers."
Okay, people. While the "man hunt, woman gather/cook/take care of babies" concept dominates high-school science textbooks, evolutionary science can't make definitive statements about early human division of labor. Fossil evidence is interpreted through the lens of modern society - today's standards are unwittingly applied to the past. Ethnographic analogues - modern-day hunter-gatherers - are practically nonexistent; but research done in the 50s and 60s suggests that a) division of labor varies between societies and b) in some cases, men and women shared many "gendered" tasks.
Relying on "caveman" stereotypes sells modern humans short. We're far more complicated than that.