1. Who invented Steam Engine (Condenser)

Answer: James Watt of Britain in 1765

2. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

3. Who invented Laser ?

Answer:

Charles H. Townes

4. Who invented Printing Press ?

Answer:

Johannes Gutenberg

5. Who invented Relativity Theory ?

Answer: Einstein of Germany in 1905.

6. Who invented Radiocarbon ?

Answer:

Willard Libby

7. Who invented Vitamin A ?

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