Bell is still insisting on the experiment. He keeps learning and consulting. At the critical moment, Edison put forward a golden suggestion, which finally enabled Bell to find the golden key to the communication between sound and current. Soon, the world's first microphone and receiver was born.
2. The story of the copier
Engineer Lester? The copier invented by Carlson was pointed out. He often frowns when he invents the copier. Hearing the story of "Farewell My Concubine" in the restaurant, I was deeply inspired, solved the toner problem, and successfully manufactured the first electrostatic copier on June 23rd, 1938.
3. The invention in the dream-separation of elements
Although Mendeleev kept fiddling with the positions of various elements with playing cards, there were always three or four elements that could not be arranged in the table. It was late at night, and Mendeleev fell asleep in a daze. In the dream, he continued to spread the table of elements, and suddenly, several metals with strange luster suddenly disappeared. Mendeleev finally completed the arrangement of the periodic table of elements.
4. The cost of life
Although he lost his dear brother, his father is dying. For his career, for the success of the experiment and for the comfort of the dead, Nobel stayed on the ship for four years. After thousands of failures, he finally succeeded in developing a safe explosive.
5. The secret of the "jack-o 'lantern" invented by mistake.
/kloc-In the mid-7th century, brand, who was penniless, tried to turn gold into a millionaire. He refined and refined, and finally made urine into "gold" by mistake. This is the white phosphorus that was called "cold light" at that time.