These days, touchscreens are everywhere. You're probably reading this on one right now.
It seems like the most normal thing in the world, just touching a screen and having it work. But almost 40 years ago, it was basically "magical" technology! Nobody had cellphones, computers had to sit on a desk and were only used at work, and there were definitely no touchscreens.
This video is from 1982. It's hilarious to see how excited the guy is over a touchscreen that probably weighed like 20lbs:
Technology sure has come a long way!