1. Who invented X-ray ?

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

2. Who invented Super Computer ?

Answer:

Seymour Cray

3. Who invented Blood Transfusion ?

Answer: Jean-Baptiste Denys of France in 1625.

4. Who invented Safety Pin ?

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

5. Who invented Open Heart Surgery ?

Answer:

Dr. Daniel Hale Williams

6. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

7. Who invented Neutron bomb ?

Answer:

Samuel T. Cohen