1. Who invented Logarithms ?

Answer:

John Napier (Scotland) invented Logarithm

2. Who invented Safety Pin ?

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

3. Who invented Laptop ?

Answer:

Adam Osborne in 1981.

4. Who invented Ballistic missile ?

Answer: Wemher von Braun of Germany in 1944.

5. Who invented Bacteria ?

Answer: Leeuwenhock of Netherlands in 1683

6. Who invented Radar ?

Answer:

Sir Robert Watson-Watt

7. Who invented Diesel Engine ?

Answer: Rudoff Diesel of Germany in 1895