Edison only attended primary school for three months in his life, and his knowledge came from his mother's teaching and self-study. His success should be attributed to his mother's understanding and patient teaching since childhood, which made Edison, who was originally considered an imbecile, become a world-famous "king of invention" when he grew up.

Edison was curious about many things since he was a child, and he liked to try it himself until he understood the truth. When he grew up, he devoted himself to research and invention according to his interest in this field. He established a laboratory in New Jersey and invented more than 2,000 kinds of things in his life, such as electric lights, telegrams, phonographs, film machines, magnetic ore separators, crushers and so on. Edison's strong research spirit made him make great contributions to the improvement of human lifestyle.

"Waste, the biggest waste is wasting time." Edison often said to his assistant. "Life is short, so we should try to do more with less time."

One day, Edison was working in the laboratory. He handed his assistant an empty glass bulb without a lampholder and said, "Measure the capacity of the bulb." He bowed his head to work again. After a long time, he asked, "What's the capacity?" He didn't hear the answer, but turned to see the assistant measuring the circumference and inclination of the light bulb with a soft ruler, holding the measured figures and bending over the table to calculate them. He said, "Time, time, why does it take so much time?" Edison came over, picked up the empty light bulb, filled it with water, handed it to his assistant, and said, "Pour the water into the measuring cup and tell me its capacity at once." The assistant read out the numbers at once. Edison said, "How easy it is to measure. It is both accurate and time-saving. Why didn't you think of that? " ? Still counting. Isn't that a waste of time? "The assistant's face turned red.

Edison murmured, "Life is too short, too short. Save time and do more! " "