What is the greatest invention of all time?

i believe internet is the greatest invention of all time ....it had shrunk the world into a room.....we can contact with any one anywhere in the world anytime...i have made many friends online..then abt information..we can get thye latest news ,inventions ,everything at our finger tips

I would say Electronics gadgets or gizmons is the greatest invention, bcoz for medical profesion also there are many electronics intruments comes, then electronics has greats market share almost in every field there is electrocnis.

I would have to say the harnessing of electricity. other wise we would be still in the dark, and because they use electron microscopes for learning about disease you now have a lot of cure for ailments that had no cure before electricity. Think about it. This has to be one of the top inventions in all of history, the first of course would be the wheel, and the second the ability to use earth to make and build houses and contents there in.

It is obviously the wheel. Pretty much every other invention has had something to do with the wheel. And, of course, the most important discovery ever was fire.