Give me but a firm spot on which to stand, and I shall move the earth.
Eureka! [I have found it!] On discovery of a method to test the purity of gold.
The perimeter of the earth is about 3,000,000 stadia and not greater.
Man has always learned from the past. After all, you can't learn history in reverse!
There are things which seem incredible to most men who have not studied Mathematics.
How many theorems in geometry which have seemed at first impracticable are in time successfully worked out!