How many people here have heard of PMS? Everybody, right? Everyone knows that women go a little crazy right before they get their period, that the menstrual cycle throws them onto an inevitable hormon
It's the part of mathematics that even mathematicians don't particularly like, 统计是数学的一部分，但是它是连数学家都不怎么喜欢的那一部分， because whereas the rest of maths is all about precision and certainty, statistics is almo
