Malcolm Gladwell

Any patent you received would protect your intellectual property for twenty years, but after that anyone could take your invention. You get an initial monopoly on your creation because we want to provide economic incentives for people to invent things like cancer drugs. But everyone gets to steal your breast-cancer cure—after a decent interval—because it is also in society’s interest to let as many people as possible copy your invention; only then can others learn from it, and build on it, and come up with better and cheaper alternatives.

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.

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: you