1. Who invented Ball-Point Pen ?

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

2. Who invented Logarithms ?

Answer:

John Napier (Scotland) invented Logarithm

3. Who invented Vitamin D ?

Answer:

Edward Mellanby discovered Vitamin D while researching a disease called rickets in 1922

4. Who invented Ballistic missile ?

Answer: Wemher von Braun of Germany in 1944.

5. Who invented watch ?

Answer:

Peter Henlein invented the first portable time piece in 1504

6. Who invented Steam Engine ?

Answer: Thomas Savery of Britain in 1698

7. Who invented Laser ?

Answer:

Charles H. Townes