1. Who invented Steam Engine ?

Answer: Thomas Savery of Britain in 1698

2. Who invented Ball-Point Pen ?

Answer: John J. Loud of U.S.A. in 1888

3. Who invented DNA Structure ?

Answer: Crick(UK), Waston(US), Wilkins(UK) in 1951

4. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

5. Who invented X-ray ?

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

6. Who invented Safety razor ?

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

7. Who invented Periodic table ?

Answer:

Dmitri Mendeleev invented Periodic Table