This is what Bill Gates would tell his teenage self

"I would explain that smartness is not single dimensional and not quite as important as I thought it was back then. I would say you might explore the developing world before you get into your forties. I wasn't very good socially back then, but I am not sure there is advice that would fix that — maybe I had to be awkward and just grow up..."

"You look at his calendar, it's pretty simple. You talk to him about a case where he thinks a business is attractive, and he knows a few basic numbers and facts about it. And [if] it gets less complicated, he feels like then it's something he'll choose to invest in.

"He picks the things that he's got a model of, a model that really is predictive and that's going to continue to work over a long-term period. And so his ability to boil things down, to just work on the things that really count, to think through the basics — it's so amazing that he can do that. It's a special form of genius."