1. Who invented Vitamin D ?

Answer:

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

2. Who invented Submarine ?

Answer:

John Philip Holland

3. Who invented paper ?

Answer:

Cai Lun

4. Who invented Biochemistry ?

Answer: Jan Baptista Van Helmont of Belgium in 1648.

5. Who invented Steam Engine (Condenser)

Answer: James Watt of Britain in 1765

6. Who invented Steam Engine ?

Answer: Thomas Savery of Britain in 1698

7. Who invented Safety Pin ?

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