1. Who invented Barometer ?

Answer: Evangelista Torricelli of Italy in 1644

2. Who invented Safety Pin ?

Answer: Walter Hunt of U.S.A. in 1849

3. Who invented Vitamin A ?

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

4. Who invented Calculus ?

Answer: Newton of Britain in 1670.

5. Who invented Stethoscope ?

Answer: Laennec of French in 1819.

6. Who invented Aspirin ?

Answer:

Felix Hoffmann invented Aspirin

7. Who invented watch ?

Answer:

Peter Henlein invented the first portable time piece in 1504