1. Who invented Vitamin D ?

Answer:

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

2. Who invented Atomic numbers ?

Answer: Moseley of Britain in 1913

3. Who invented Printing Press ?

Answer:

Johannes Gutenberg

4. Who invented Neutron bomb ?

Answer:

Samuel T. Cohen

5. Who invented X-ray ?

Answer: W.K. Roentgen of Germany in 1895.

6. Who invented Bacteria ?

Answer: Leeuwenhock of Netherlands in 1683

7. Who invented Electron ?

Answer: Thomson. J of Britain in 1897