司马光七岁，凛然如成人，闻讲《左氏春秋》，爱之，退为家人讲，即了其大旨。自是手不释书，至不知饥渴寒暑。群儿戏于庭，一儿登瓮，足跌没水中，众皆弃（去），光持石击瓮，（破）之，水迸，儿得活。

It’s said Si Ma Guang was a bright child, had the mind of an adult when he was only 7. He spent most of his time reading “Chronicle of Zuo”, he told the parents what he learnt from the book, and they were delighted. Si Ma Guang was so into the book that sometimes he forgot to eat and drink, and didn’t care whether it’s hot or cold.

One day, a group of kids were playing in his yard; one kid accidentally fell into a deep water-tank made of clay. Others run away fearing the kid might get drowned. Hearing the noisy, Si Ma Guang dropped his book, fetched a piece of rock, and knocked hard on the tank. The tank burst, the kid was saved.

the moral of this story: you can be a nerd and a hero at the sametime. :O))))