1. Who invented Nylon ?

Answer:

Wallace Carothers

2. Who invented Vitamin A ?

Answer: Mc Collum and M.Davis of U.S.A. in 1913

3. Who invented Vitamin D ?

Answer:

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

4. Who invented Gramophone ?

Answer:

Emile Berliner in 1887.

5. Who invented Piano ?

Answer:

Bartolomeo Cristofori

6. Who invented Logarithms ?

Answer:

John Napier (Scotland) invented Logarithm

7. Who invented Safety Pin ?

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