1. Who invented Helicopter ?

Answer:

Igor Sikorsky

2. Who invented Circulation of blood ?

Answer: William Harvey of Britain in 1628

3. Who invented Open Heart Surgery ?

Answer:

Dr. Daniel Hale Williams

4. Who invented Safety Pin ?

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

5. Who invented Vaccine of Rabies ?

Answer: Louis Pasteur of France in 1885

6. Who invented Periodic table ?

Answer:

Dmitri Mendeleev invented Periodic Table

7. Who invented Proton ?

Answer:

Ernest Rutherford