Eureka! [I have found it!] On discovery of a method to test the purity of gold.
Eureka! (I have found it!).
How many theorems in geometry which have seemed at first impracticable are in time successfully worked out!
The centre of gravity of any cylinder is the point of bisection of the axis.
The diameter of the earth is greater than the diameter of the moon and the diameter of the sun is greater than the diameter of the earth.
Give me but a firm spot on which to stand, and I shall move the earth.