1. Who invented Electron ?

Answer: Thomson. J of Britain in 1897

2. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

3. Who invented Vitamin A ?

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

4. Who invented Printing Press ?

Answer:

Johannes Gutenberg

5. Who invented Computer ?

Answer:

Charles Babbage

6. Who invented Radar ?

Answer:

Sir Robert Watson-Watt

7. Who invented Vitamin D ?

Answer:

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