my grandpa, who worked forever as an engineer at mcdonald douglas, he told my brother and I that he had to learn how to use the first computers... they took "punch cards" that you slid into a slot and whatever configuration the punches were is what the computer did...
he also designed the nuts/bolts/screws that went on a # of airplanes that the military still uses today (f-16 i do believe was one of them), and the tools that worked on them.
now we have friggin palm pilots that have as much power as that thing that took up a living room!
wonders of science and how far we've come. i think of that every time i'm flying over an ocean... "y'know, we were just learning about fire, and here i am in a giant metal tube with wings, hauling ass over the ocean..."
It's a picture from a US submarine control room display that's been photoshoped.
However I have punched many a punch card in my early days of computer science when computers used core memory and a large memory was around 30 kilobytes, that's 30 thousand! as opposed to most laptops that come standard with 250 million!