1. Who invented Steam Engine (Condenser)

Answer: James Watt of Britain in 1765

2. Who invented Vaccine of Rabies ?

Answer: Louis Pasteur of France in 1885

3. Who invented Hydrogen bomb ?

Answer:

Edward Teller

4. Who invented Vitamin D ?

Answer:

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

5. Who invented X-ray ?

Answer: W.K. Roentgen of Germany in 1895.

6. Who invented Printing Press ?

Answer:

Johannes Gutenberg

7. Who invented Bicyle ?

Answer: Kirkpatrick Macmillan of Britain.