Almost everything we call a “need” is a story our mind learned to believe. In I Need That, I talk about how quickly our definition of “need” shifts. Indoor plumbing was once a luxury … not all that long ago. My grandparents’ farm still had an outhouse and a hand-pump well when I was a kid. And they felt perfectly satisfied. Air-conditioning used to be something you bragged about until the 1990s. Today even the cheapest cars include it because if you live somewhere hot, you need that. But...