What is the greatest tool known to mankind?

Question

I know the answer (at least I think I do) but I am looking for a quote. If anyone has a quote with an answer to this question, please provide it.

Feel free to throw in your oppinion even if you do not have a quote.

Answer 1

For things that evolved and didn't have to be invented, it's the opposable thumb and the human brain.

For inventions, nothing beats the wheel.

Answer 2

a toothbrush - without it we would sicken and die, our teeth would fall out, we couldn't eat the right food to maintain our bodies, if we do not keep our teeth clean, plaque would build up in our arteries  (heart attacks), kidneys would fail . . .

Answer 3

A child miseducated is a child lost.--John F. Kennedy

i think its knowledge

Answer 4

prayer. with god all things are possible.

Answer 5

I think it might have been the first time somebody struck a piece of Flint against another rock and made a spark which created a flame. Without that flint and flame we would never have had metal objects.

Answer 6

George W. Bush

(ha ha ha!)

Answer 7

The knife edge from chipped flint to fired carbide a sharp blade is the basis of all manufacturing and processing.

Answer 8

The imagination.