Man has always learned from the past. After all, you can't learn history in reverse!
The centre of gravity of any cylinder is the point of bisection of the axis.
Eureka! [I have found it!] On discovery of a method to test the purity of gold.
The centre of gravity of any parallelogram lies on the straight line joining the middle points of opposite sides.
Eureka! (I have found it!).
Having been the discoverer of many splendid things, he is said to have asked his friends and relations that, after his death, they should place on his tomb a cylinder enclosing a sphere, writing on it the proportion of the containing solid to that which is contained.