"When a couple move into a new house, they’re more apt to purchase a different kind of cereal." That and dozens of other habit changing events that make us “vulnerable to intervention by marketers” explained in this generally excellent—yet utterly creepy—article. With loads more great quotes from misanthropic marketers like "identifying pregnant customers is harder than it sounds." No kidding. (Spoiler alert! Target's stalker database knew a teenage girl was pregnant before her dad did.) There's also a great section on how "Go See," when applied to marketing, turned a dud product into a billion dollar blockbuster.
Why money is like friction, and what that has to do with Mitt Romney. Explaining how the economy works with a physics analogy, which seems like it would make it more complicated but actually makes it simpler.