Sorry if this is a dumb question, but where wo…

Sorry if this is a dumb question, but where would I look if I needed "real proof" that the wage gap is real and women are not, in fact, treated the same as men in the workplace? Asking so I'll have some more sources when my little conservative-in-training brother decides to start this argument again. (All of my usual ones are lies or outdated or too liberal… any tips?)

My gut feeling is if everything you show him is too liberal, too old, too this, too that…nothing will be good enough. He doesn’t want to believe you.