Zu Chongzhi in the Southern Dynasties, under the extremely simple conditions at that time, made a lot of complicated calculations with pieces of small bamboo pieces. After numerous failures, he was finally the first in the world to make Pi accurate to the seventh place after the decimal point.

Edison, the great inventor, made countless failed experiments in the process of inventing electric light. He tried more than 6000 kinds of fiber materials, and finally decided to use tungsten wire as filament, which improved the service life of the electric lamp.

Famous motto:

Frustration is a stepping stone for the strong and a bottomless pit for the weak.

After some setbacks, I gained some knowledge.

There is no such thing as failure for indomitable people.