1. Light Bulb: Thomas Edison (1879)
2. Telephone: Alexander Graham Bell (1876)
3. Airplane: Orville and Wilbur Wright (1903)
4. Automobile: Karl Benz (1885)
5. Personal Computer: Steve Jobs (Apple) and Bill Gates (Microsoft) (1970s-1980s)
6. Internet: Vinton Cerf and Robert Kahn (1969)
7. World Wide Web (WWW): Tim Berners-Lee (1989)
8. Radio: Guglielmo Marconi (1895)
9. Television: Philo Farnsworth (1927)
10. Camera: Louis Daguerre and Joseph Nicéphore Niépce (1830s)
11. Rocket Engine: Robert Goddard (1926)
12. Microscope: Zacharias Janssen (1590)
13. Steam Engine: Thomas Savery (1698)
14. Printing Press: Johannes Gutenberg (15th century)
15. Compass: Chinese inventors, possibly in the 11th century
16. Gunpowder: Chinese inventors, possibly in the 9th century
17. Paper: Chinese inventors, 2nd century BCE
18. Vaccination: Edward Jenner (1796)
19. Antibiotic: Alexander Fleming (1928)
20. Transistor: John Bardeen, Walter Brattain, and William Shockley (1947)
