1. Who invented Safety Pin ?

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

2. Who invented Java Language ?

Answer:

James Gosling

3. Who invented Logarithms ?

Answer:

John Napier (Scotland) invented Logarithm

4. Who invented Optical Fibre ?

Answer:

Indian-born American physicist Narinder Kapany

5. Who invented Radiocarbon ?

Answer:

Willard Libby

6. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

7. Who invented Vitamin D ?

Answer:

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