Today is Equal Pay Day in the US, which is so chosen because it marks, on average, how much longer a woman would have to work to make the same as a man did during the previous year. Women across the US are... well, not quite "celebrating", but marking the day with events and protests, and probably more than a few private grievances about their overpaid male colleagues and bosses. But while the pay gap pervades most occupations, it's often particularly pronounced at higher income levels -- which many jobs in tech are.