1. Who invented Stethoscope ?

Answer: Laennec of French in 1819.

2. Who invented Atomic theory ?

Answer: Dalton of Britain in 1803.

3. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

4. Who invented Circulation of blood ?

Answer: William Harvey of Britain in 1628

5. Who invented Nylon ?

Answer:

Wallace Carothers

6. Who invented Steam Engine (Piston)

Answer: Thomas Newcomen of Britain in 1712

7. Who invented Radiocarbon ?

Answer:

Willard Libby