According to a legend, Leizu, Chinese Empress, wife of the Yellow Emperor of Chia, discovered silkworms spinning cocoons. She collected some cocoons and dropped a cocoon into the steaming water and amazed when a shining and soft thread started to separate itself from cocoon. Thus she invented silk loom.
Early matches were made of sticks of pinewood with sulfur.
Magnetic compasses were heavy and difficult to carry at first.
Chinese developed the process of refining iron into steel in 2nd century BC.