1. Who invented Circulation of blood ?

Answer: William Harvey of Britain in 1628

2. Who invented Dynamo ?

Answer:

Hypolite Pixii of France in 1832

3. Who invented X-ray ?

Answer: W.K. Roentgen of Germany in 1895.

4. Who invented Transistor ?

Answer: Bardeen, Shockley & Britain of U.S.A. in 1948

5. Who invented paper ?

Answer:

Cai Lun

6. Who invented Penicillin ?

Answer: Alexander Fleming of Britain in 1928.

7. Who invented Open Heart Surgery ?

Answer:

Dr. Daniel Hale Williams