In the late 70s or early 80s..(don't recall which) I took a course on what computers will become. Actually it was a lecture or two on predictions, possibilities , and outcomes of the coming so called, "computer age"...
It was called that then...but the professor said, (back then) that one day we would have hand held computers that would be so cheap that everyone could afford one..I remember basically laughing at what he said, and saying that is impossible. Short time later..(a couple of years later we did have small adding machines which would almost be considered a for runner of early computers...some were indeed hand held..(I thought then...early 80s...maybe that guy could someday be correct..some day...???)
Well, some day has arrived. Not only are the computers hand held, they double as adding machines and telephones, and yes, you can even send messages over them. As well as they will give you voice answers to questions..(no I don't have one of those yet, ...but I may buy one)..