司馬光七歲，凜然如成人，聞講《左氏春秋》，愛之，退為家人講，即了其大旨。自是手不釋書，至不知饑渴寒暑。群兒戲於庭，一兒登瓮，足跌沒水中，眾皆棄（去），光持石擊瓮，（破）之，水迸，兒得活。

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))))