Camilo Moreno-Salamanca

From 1973 to 2023, the size of the average new single-family house increased by 50 percent, and the share of new single-family houses that have air-conditioning doubled, to 98 percent. Streaming services, video-game consoles, and flatscreen TVs make the living room more diverting than any 20th-century theater or arcade. Yet conveniences can indeed ... See more

If your product isn’t viral by design, you’re missing the point. Users should want to tell their friends about your product because it makes their lives better, not because you’re begging them. Ask yourself: Will this be more valuable if shared? If not, then you’ve got some rethinking to do.

The most dramatic tendency that Sayer uncovered is that single men without kids—who have the most leisure time—are overwhelmingly likely to spend these hours by themselves. And the time they spend in solo sedentary leisure has increased, since 2003, more than that of any other group Sayer tracked. This is unfortunate because, as Sayer wrote, “well-... See more

The middle ring is key to social cohesion, Dunkelman said. Families teach us love, and tribes teach us loyalty. The village teaches us tolerance. Imagine that a local parent disagrees with you about affirmative action at a PTA meeting.