1. Who invented Vitamin A ?

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

2. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

3. Who invented Bacteria ?

Answer: Leeuwenhock of Netherlands in 1683

4. Who invented Steam Engine (Piston)

Answer: Thomas Newcomen of Britain in 1712

5. Who invented Printing Press ?

Answer:

Johannes Gutenberg

6. Who invented Steam Engine ?

Answer: Thomas Savery of Britain in 1698

7. Who invented Vitamin B1 ?

Answer:

Casimir Funk discovered in 1912