1. Who invented Vitamin A ?

Answer: Mc Collum and M.Davis of U.S.A. in 1913

2. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

3. Who invented X-ray ?

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

4. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

5. Who invented Barometer ?

Answer: Evangelista Torricelli of Italy in 1644

6. Who invented Chemotherapy ?

Answer: Paracelsus of Switzerland

7. Who invented Proton ?

Answer:

Ernest Rutherford