Actually the gap is measured by full time equivalent wage rates - if we measured by actual money earned its much, much, much bigger.
Actually, men and women don’t always get paid the same doing the same job.

Actually, if women all quit those low paid caring jobs, then who would look after your kids? Who would take care of you if you got a disability?
Actually, women do dangerous work too. Anyway, 'danger level' doesn’t equate to pay – how dangerous is it to be a merchant banker?

Actually, studies show bosses are less likely to hire women for those higher paying jobs.
Actually, both parents make the choice to have a baby.
Actually, that one female boss you had that one time doesn’t prove what you think it does.