Beer
quantitative easing
Modern plumbing.
Clean water.
Probably eastern martial Arts type tai chi knowledge about the body and healing and shit
Toilet Paper AC current
The internal combustion engine.
The 'Mars Rover'!
Writing.
It is the communication of information without the limits of time or distance. It's not perfect, but most modern inventions would be nearly impossible without it, given that modern technology is often developed on the back of more discoveries and knowledge one could personally gain in a lifetime.
Masturbation death coaster is also quite good.
Given the way things are going, I think the future will likely look back at the computer with the same significance we should give to writing.
(post is archived)