1. Who invented Steam Engine ?

Answer: Thomas Savery of Britain in 1698

2. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

3. Who invented Vaccine of Rabies ?

Answer: Louis Pasteur of France in 1885

4. Who invented Vitamin A ?

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

5. Who invented Proton ?

Answer:

Ernest Rutherford

6. Who invented HIV ?

Answer:

7. Who invented Air Conditioning ?

Answer:

Willis Carrier in 1902