1. Who invented Steam Engine ?

Answer: Thomas Savery of Britain in 1698

2. Who invented Open Heart Surgery ?

Answer:

Dr. Daniel Hale Williams

3. Who invented Neutron bomb ?

Answer:

Samuel T. Cohen

4. Who invented Neutron ?

Answer:

JAMES CHADWICK in 1932

5. Who invented Helicopter ?

Answer:

Igor Sikorsky

6. Who invented Proton ?

Answer:

Ernest Rutherford

7. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.