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The greatest inventions are those which trigger a chain effect of subsequent inventions and improve lives of people dramatically. By simply allowing to complete more work. Or by opening new horizons. Such as wheel, engine and electricity.
Indoor plumbing. That's above electricity. More people die every year because they lack this than you would believe.
Coffee!!! I truly believe that God made coffee His last great creation. Now, we can tolerate each other....lol
the internal cumpustion engine. followed closely by the gun.
THE HOLY GRAIL OF COMPUTERS APPLE
An IBM computer(your welcome)
Computers and the internet.
Radio wave communication.
The wheel. Lmao