In Hu Bei province in china in 1965, this sword was found. After studying, this sword was made in the Spring and Autumn Period (770-476BC). It consists of copper and tin. Its owner is Goujian who is a famous people in ancient Chinese history.
    Why we know its owner is Goujian? Because there are 8 words in this sword. The words mean Goujian made it by himself.
    One time, Goujian sword was displayed. The worker used it to cut 20 paper. People just heard “swish”. All of the paper was cut. You know this sword was made in 2000 years ago.