1. Who invented Helicopter ?

Answer:

Igor Sikorsky

2. Who invented Bacteria ?

Answer: Leeuwenhock of Netherlands in 1683

3. Who invented Laptop ?

Answer:

Adam Osborne in 1981.

4. Who invented Ball-Point Pen ?

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

5. Who invented Circulation of blood ?

Answer: William Harvey of Britain in 1628

6. Who invented Safety Pin ?

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

7. Who invented Electron ?

Answer: Thomson. J of Britain in 1897