I'm going to say the airplane. How about you?
It keeps hot things hot, and cold things cold.
How does it know?
Penicillin, A lot of us are alive because of it.
definitely the internet. This discussion is not happening without it.
Lets go Brent!
If we were to go back a few years further, I would suggest the automobile, because of the tremendous change it created in society. Barring that, I think I would go with the PC.
R.I.P. Cyrano and Roxanne.
AC electric and the telephone
I live in Florida. trust me, it's central air.
Jacob Schlottke---Gone too soon, and the world is a little less bright because of it. RIP, brother.
One, two, Evans is coming for you...