The amount of time spent asleep didn't really matter. He had decided that the key to it all — the one thing that determined whether the nap would act… - Neal Stephenson

But Henry wasn’t a parent, and he didn’t understand that when you were, almost nothing was more satisfying than seeing your kid sleep.

I would say that the ability of people to agree on matters of fact not immediately visible — states of affairs removed from them in space and time — ramped up from a baseline of approximately zero to a pretty high level around the time of the scientific revolution and all that, and stayed there and became more globally distributed up through the Cronkite era, and then dropped to zero incredibly quickly when the Internet came along.

He had had many conversations during his long life. Some were fascinating and stayed with him more than a century later. Others were less so. As a younger man he had tolerated those as part of the cost of doing business—a sort of tax that all people must pay in order to take part in civilized society. When he had turned one hundred, he had decided to stop paying that tax. Henceforth he would engage only in conversations that really interested him—which, with a few exceptions for close friends and family members, meant conversations with a purpose.