1. Who invented Safety Pin ?

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

2. Who invented Gramophone ?

Answer:

Emile Berliner in 1887.

3. Who invented Aspirin ?

Answer:

Felix Hoffmann invented Aspirin

4. Who invented Logarithms ?

Answer:

John Napier (Scotland) invented Logarithm

5. Who invented Floppy disk ?

Answer: IBM in 1970

6. Who invented Hydrogen bomb ?

Answer:

Edward Teller

7. Who invented Bacteria ?

Answer: Leeuwenhock of Netherlands in 1683