Eureka! [I have found it!] On discovery of a method to test the purity of gold.
Give me a place to stand, and a lever long enough, and I will move the world.
Give me but a firm spot on which to stand, and I shall move the earth.
Eureka! (I have found it!).
Man has always learned from the past. After all, you can't learn history in reverse!
How many theorems in geometry which have seemed at first impracticable are in time successfully worked out!