1. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

2. Who invented Helicopter ?

Answer:

Igor Sikorsky

3. Who invented Neutron bomb ?

Answer:

Samuel T. Cohen

4. Who invented Penicillin ?

Answer: Alexander Fleming of Britain in 1928.

5. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

6. Who invented Laptop ?

Answer:

Adam Osborne in 1981.

7. Who invented Bicyle ?

Answer: Kirkpatrick Macmillan of Britain.