2. Bi Sheng, movable type printing;
3. Zhang Heng: Seismograph;
4. Siemens: The first product was the telegraph, which pointed out with a pointer that the alphabetical order was not Morse code.
5: Bell telephone;
6. Cai Lun: papermaking;
7. Nobel Prize: gunpowder
8. Edison: electric light ....
9. Fulton: The first ship driven by a steam engine was designed and built.
10: moss: telegram!