1. Who invented Open Heart Surgery ?

Answer:

Dr. Daniel Hale Williams

2. Who invented Circulation of blood ?

Answer: William Harvey of Britain in 1628

3. Who invented Radar ?

Answer:

Sir Robert Watson-Watt

4. Who invented Steam Engine (Piston)

Answer: Thomas Newcomen of Britain in 1712

5. Who invented Radiocarbon ?

Answer:

Willard Libby

6. Who invented Steam Engine ?

Answer: Thomas Savery of Britain in 1698

7. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805