1. Who invented Steam Engine ?

Answer: Thomas Savery of Britain in 1698

2. Who invented Nylon ?

Answer:

Wallace Carothers

3. Who invented Electron ?

Answer: Thomson. J of Britain in 1897

4. Who invented Safety razor ?

Answer: King Camp Gillette of U.S.A. in 1903

5. Who invented Logarithms ?

Answer:

John Napier (Scotland) invented Logarithm

6. Who invented Submarine ?

Answer:

John Philip Holland

7. Who invented Vitamin D ?

Answer:

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