There’s a project. A U.S. government project I guess you’d have to call it. Secret, naturally; as what isn’t in government these days? In my opinion, and that of a handful of others, it’s more important than all the nuclear, space-exploration, satellite, and rocket programs put together, though a hell of a lot smaller. I tell you right off that I can’t even hint what the project is about. And believe me, you’d never guess.

They’re back there in the past, trampling around, changing things, aren’t they? They don’t know it. They’re just living their happy lives, but changing small events. Mostly trivial, with no important effects. But every once in a while the effect of some small changed event moves on down to the—