Paul Revere's ride is perhaps the most famous historical example of a word-of-mouth epidemic. A piece of extraordinary news traveled a long distance … - Malcolm Gladwell

Sesame Street succeeded because it learned how to make television sticky.

The scholars who research happiness suggest that more money stops making people happier at a family income of around seventy-five thousand dollars a year. After that, what economists call “diminishing marginal returns” sets in. If your family makes seventy-five thousand and your neighbor makes a hundred thousand, that extra twenty-five thousand a year means that your neighbor can drive a nicer car and go out to eat slightly more often. But it doesn’t make your neighbor happier than you, or better equipped to do the thousands of small and large things

As the playwright George Bernard Shaw once put it: “The reasonable man adapts himself to the world: the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.