1. Who invented Barometer ?

Answer: Evangelista Torricelli of Italy in 1644

2. Who invented Air Conditioning ?

Answer:

Willis Carrier in 1902

3. Who invented Safety razor ?

Answer: King Camp Gillette of U.S.A. in 1903

4. Who invented Ball-Point Pen ?

Answer: John J. Loud of U.S.A. in 1888

5. Who invented Bacteria ?

Answer: Leeuwenhock of Netherlands in 1683

6. Who invented Chemotherapy ?

Answer: Paracelsus of Switzerland

7. Who invented CT scan ?

Answer: Hounsfield by Britain in 1973.