1. Who invented Stethoscope ?

Answer: Laennec of French in 1819.

2. Who invented Aspirin ?

Answer:

Felix Hoffmann invented Aspirin

3. Who invented Bakelite ?

Answer: Leo H. Baekeland of Belgium in 1907.

4. Who invented Floppy disk ?

Answer: IBM in 1970

5. Who invented Transformer ?

Answer:

Ottó Bláthy

6. Who invented Neutron bomb ?

Answer:

Samuel T. Cohen

7. Who invented Calculus ?

Answer: Newton of Britain in 1670.