Discoveries and Inventions:
| S.No. | Discovery/Invention | Scientist |
| 1. | Wireless Telegraphy | Marconi |
| 2. | Telephone | Graham Bell |
| 3. | Telescope | Galileo |
| 4. | Fountain Pen | Lewis E. Waterman |
| 5. | Revolver | Colt |
| 6. | Electric Bulb | Thomas Alva Edison |
| 7. | Calculating Machine | Pascal |
| 8. | Type Writer | Sholes |
| 9. | Helicopter | Brequet |
| 10. | Petrol Engine | Nicolas Otto |
| 11. | Diesel Engine | Rudolph Diesel |
| 12. | Gas Engine | Dailmer |
| 13. | Gramophone | Thomas Elva Edison |
| 14. | Microphone | Graham Bell |
| 15. | Pneumatic Tyre | Dunlop |
| 16. | Aero plane | Orville & Wilbur Wright |
| 17. | Motor Car | Austin |
| 18. | Steam Engine | James Watt |
| 19. | Magazine of gun | P.Von Mauser |
| 20. | X-rays | Wilhelm Rongten |
| 21. | Neutron | Chadwick |
| 22. | Electron | J.J.Thomson |
| 23. | Atomic Structure | Bohr |
| 24. | Railway Engine | Stephenson |
| 25. | Bicycle | Macmillan |
| 26. | Safety Razor | Gillete |
| 27. | Transistor | Shokley & Brattain |
| 28. | Stethoscope | Rene Laennec |
| 29. | Sewing Machine | Howe |
| 30. | Television | J. Baird |
| 31. | Steam turbine | Sir C. Parsons |
| 32. | Thermometer | Farenheit |
| 33. | Printing press | Johann Gutenberg |
| 34. | Radium | Madam Curie |
| 35. | Photographic film | Kodak |
| 36. | Military Tank | Swinton |
| 37. | Dynamite | Alfred Nobel |
| 38. | Submarine | David Bushnell |
| 39. | Jet Propulsion | Frank Whittle |
| 40. | Pasteurization | Louis Pasteur |
| 41. | Laws of Gravitation | Newton |
| 42. | Cinematography | Edison |
| 43. | Ball point pen | John J. Loud |
| 44. | Atom bomb | Robert Oppenheimer |
| 45. | Electric battery | Alessandro Volta |
| 46. | Homeopathy | Hahnemann |
| 47. | Insulin | F.Banting |
| 48. | Lift | Otis |
| 49. | Machine gun | James Puckle |
| 50. | Laws of motion | Newton |
| 51. | Radar | Robert Watson |
| 52. | Telegraph Code | Samuel Morse |
| 53. | Steam boat | Fulton |
| 54. | Radio transmitter | Alexanderson |
| 55. | Refrigerator | James Harisson & Alexander Catlin |
| 56. | Heart transplant | Christian Barnard |
| 57. | Car (Petrol) | Karl Benz |
| 58. | Carburetor | Gottlieb Daimler |
| 59. | Washing Machine | Alva. J. Fisher |
| 60. | Electric Iron | Henry W. Seeley |
| 61. | Laser | T. H. Maimah |
| 62. | Hydrogen Bomb | Edward Teller |
| 63. | Safety Match | John Walker |
| 64. | Microscope | Z. Janessen |
| 65. | Motor cycle | G. Daimler |
| 66. | Neutron bomb | Samuel Cohen |
| 67. | Optical Fiber | Narinder Kapany |
| 68. | Pencil | Jacques-Nicolas Conte |
| 69. | Transistor radio | Sony |
| 70. | Transformer | Michael Faraday |
| 71. | Watch | Bartholomew Manfredi |
| 72. | Bacteria | Leeuwenhock |
| 73. | Vaccination | Edward Jenner |
| 74. | Choloroform | James Simpson |
| 75. | Asprin | Dreser |
| 76. | Vitamin A | McCollum & M. Davis |
| 77. | Vitamin C | Froleich Holst |
| 78. | Vitamin D | McCollum |
| 79. | Vitamin B1 | Minot & Murphy |
| 80. | Pencillin | Alexander Fleming |
| 81. | Artificial Heart | Willem Kolff |