1. Who invented Bacteria ?

Answer: Leeuwenhock of Netherlands in 1683

2. Who invented Ball-Point Pen ?

Answer: John J. Loud of U.S.A. in 1888

3. Who invented Air Conditioning ?

Answer:

Willis Carrier in 1902

4. Who invented Printing Press ?

Answer:

Johannes Gutenberg

5. Who invented Ballistic missile ?

Answer: Wemher von Braun of Germany in 1944.

6. Who invented Hydrogen bomb ?

Answer:

Edward Teller

7. Who invented Safety razor ?

Answer: King Camp Gillette of U.S.A. in 1903