Do you ever think about the future? Well, don’t dwell on it for too long, or you’ll have to rethink it all over again.
That’s how fast it’s changing.
Think of history as a line. Up until modern times, it was pretty much a straight line, in which one event led to another in a relatively predictive manner. Things didn’t always make sense at the time, but they usually did when we looked back on them. The line of knowledge and invention angled upward, but it was still basically a straight line.