1. Who invented Stethoscope ?

Answer: Laennec of French in 1819.

2. Who invented Air Conditioning ?

Answer:

Willis Carrier in 1902

3. Who invented Neutron bomb ?

Answer:

Samuel T. Cohen

4. Who invented Gramophone ?

Answer:

Emile Berliner in 1887.

5. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

6. Who invented Calculus ?

Answer: Newton of Britain in 1670.

7. Who invented Vitamin C ?

Answer:

Scottish naval surgeon James Lind in 1747