Man Has Always Learned From

How Many Theorems In Geometry Which Have Seemed At First Impracticable Are In Time Successfully Worked Out!

It Follows At Once From The Last Proposition That The Centre Of Gravity Of Any Triangle Is At The Intersection Of The Lines Drawn From Any Two Angles To The Middle Points Of The Opposite Sides Respectively.

Give Me A Place To Stand, And A Lever Long Enough, And I Will Move The World.

Eureka, Eureka! (i Found It, I Found It!).

Man Has Always Learned From The Past. After All, You Can't Learn History In Reverse!