Susan Cain is on a mission to remind people that introverts are as valuable as extroverts, even if they're not as good at singing their own praises.  Here she explains how the cult of the extrovert evolved with the economy, and how the best teams are made from a combination of both kinds of brains. Also, some background on one of the better jokes from the first episode of Silicon Valley.   Adapted from Cain's book, "Quiet: The Power of Introverts" and live illustrated by Molly Crabapple.