1. Who invented Safety Pin ?

Answer: Walter Hunt of U.S.A. in 1849

2. Who invented Super Computer ?

Answer:

Seymour Cray

3. Who invented X-ray ?

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

4. Who invented Steam Engine (Piston)

Answer: Thomas Newcomen of Britain in 1712

5. Who invented Vitamin C ?

Answer:

Scottish naval surgeon James Lind in 1747

6. Who invented HIV ?

Answer:

7. Who invented Diesel Engine ?

Answer: Rudoff Diesel of Germany in 1895