1. Who invented Stethoscope ?

Answer: Laennec of French in 1819.

2. Who invented Vitamin D ?

Answer:

Edward Mellanby discovered Vitamin D while researching a disease called rickets in 1922

3. Who invented Microphone ?

Answer:

Emile Berliner invented the first microphone in 1876.

4. Who invented Logarithms ?

Answer:

John Napier (Scotland) invented Logarithm

5. Who invented Bicyle ?

Answer: Kirkpatrick Macmillan of Britain.

6. Who invented Penicillin ?

Answer: Alexander Fleming of Britain in 1928.

7. Who invented Diesel Engine ?

Answer: Rudoff Diesel of Germany in 1895