1. Who invented Logarithms ?

Answer:

John Napier (Scotland) invented Logarithm

2. Who invented Circulation of blood ?

Answer: William Harvey of Britain in 1628

3. Who invented Gramophone ?

Answer:

Emile Berliner in 1887.

4. Who invented Ball-Point Pen ?

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

5. Who invented Diesel Engine ?

Answer: Rudoff Diesel of Germany in 1895

6. Who invented Chemotherapy ?

Answer: Paracelsus of Switzerland

7. Who invented Printing Press ?

Answer:

Johannes Gutenberg