Top 20 greatest inventions of all time | educational | fit4hit

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Top Twenty invention that changed the world

1. FIRE:
2. WHEEL
3. NAIL
4. OPTICAL LENSES
5. COMPASS
6. PAPER
7. GUNPOWDER
8. PRINTING PRESS
9. ELECTRICITY
10. STEAM ENGIN
11. INTERNAL COMBUSTION ENGINE
12. TELEPHONE
13. VACCINATION
14. CARS
15. AIRPLANE
16. PENICILLIN
17. ROCKETS
18. NUCLEAR FISSION
19. SEMICONDUCTORS
20. PERSONAL COMPUTER
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