1. Who invented Calculus ?

Answer: Newton of Britain in 1670.

2. Who invented Bacteria ?

Answer: Leeuwenhock of Netherlands in 1683

3. Who invented watch ?

Answer:

Peter Henlein invented the first portable time piece in 1504

4. Who invented Safety razor ?

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

5. Who invented Laser ?

Answer:

Charles H. Townes

6. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

7. Who invented Nylon ?

Answer:

Wallace Carothers