Example: In 187, a British scientist accidentally spilled nitric acid on the test bench in the laboratory. He grabbed a piece of cotton yarn and wiped it clean, then threw it into the dirt box. Soon, this cotton yarn soaked in nitric acid spontaneously ignited. He invented nitrocellulose powder by the later research of this matter. Nitrocellulose replaced black powder and became the main gun propellant in Europe.

Famous saying: Nine out of ten people fail, so I work ten times harder, that is, I never dare to fully trust my ability. In fact, I can't do anything, and I will always be a loser. Those who want to do everything will fail in the last few steps when applying it to new situations, but the truth is not afraid of failure and knows to limit myself.