1. Who invented Neutron bomb ?

Answer:

Samuel T. Cohen

2. Who invented Vitamin D ?

Answer:

Edward Mellanby discovered Vitamin D while researching a disease called rickets in 1922

3. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

4. Who invented Safety Pin ?

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

5. Who invented Piano ?

Answer:

Bartolomeo Cristofori

6. Who invented Electron ?

Answer: Thomson. J of Britain in 1897

7. Who invented Floppy disk ?

Answer: IBM in 1970