1. Who invented Vitamin D ?

Answer:

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

2. Who invented Logarithms ?

Answer:

John Napier (Scotland) invented Logarithm

3. Who invented colour television ?

Answer:

Peter Carl Goldmark

4. Who invented Steam Engine ?

Answer: Thomas Savery of Britain in 1698

5. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

6. Who invented Automatic rifle ?

Answer: John Browning of U.S.A. in 1918.

7. Who invented Steam Engine (Piston)

Answer: Thomas Newcomen of Britain in 1712