1. Who invented Vitamin D ?

Answer:

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

2. Who invented Bakelite ?

Answer: Leo H. Baekeland of Belgium in 1907.

3. Who invented Calculus ?

Answer: Newton of Britain in 1670.

4. Who invented Chloroform as anaesthetic ?

Answer: James Simpson of Britain in 1847.

5. Who invented Electron ?

Answer: Thomson. J of Britain in 1897

6. Who invented Vaccine of Rabies ?

Answer: Louis Pasteur of France in 1885

7. Who invented Ball-Point Pen ?

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