Historians start with Cleopatra and the pharaohs and comb through every year in human history ever since, looking in every corner of the world for ev… - Malcolm Gladwell

Just think about how many times you have criticized someone else, in hindsight, for their failure to spot a liar. You should have known. There were all kinds of red flags. You had doubts. Levine would say that’s the wrong way to think about the problem. The right question is: were there enough red flags to push you over the threshold of belief? If there weren’t, then by defaulting to truth you were only being human.

Eric Hanushek, an economist at Stanford, estimates that the students of a very bad teacher will learn, on average, half a year’s worth of material in one school year. The students in the class of a very good teacher will learn a year and a half’s worth of material. That difference amounts to a year’s worth of learning in a single year. Teacher effects dwarf school effects: your child is actually better off in a bad school with an excellent teacher than in an excellent school with a bad teacher.

The Holy Fool is a truth-teller because he is an outcast. Those who are not part of existing social hierarchies are free to blurt out inconvenient truths or question things the rest of us take for granted.