1. Who invented Vitamin D ?

Answer:

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

2. Who invented Electron ?

Answer: Thomson. J of Britain in 1897

3. Who invented HIV ?

Answer:

4. Who invented Open Heart Surgery ?

Answer:

Dr. Daniel Hale Williams

5. Who invented Java Language ?

Answer:

James Gosling

6. Who invented Hydrogen bomb ?

Answer:

Edward Teller

7. Who invented Stethoscope ?

Answer: Laennec of French in 1819.