1. Who invented Safety Pin ?

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

2. Who invented Electron ?

Answer: Thomson. J of Britain in 1897

3. Who invented Aeroplane

Answer: Orville & Wilbur Wright in 1903

4. Who invented Periodic table ?

Answer:

Dmitri Mendeleev invented Periodic Table

5. Who invented Biochemistry ?

Answer: Jan Baptista Van Helmont of Belgium in 1648.

6. Who invented Air Conditioning ?

Answer:

Willis Carrier in 1902

7. Who invented Super Computer ?

Answer:

Seymour Cray