1. Who invented Circulation of blood ?

Answer: William Harvey of Britain in 1628

2. Who invented Steam Engine (Piston)

Answer: Thomas Newcomen of Britain in 1712

3. Who invented Logarithms ?

Answer:

John Napier (Scotland) invented Logarithm

4. Who invented Safety Pin ?

Answer: Walter Hunt of U.S.A. in 1849

5. Who invented Electron ?

Answer: Thomson. J of Britain in 1897

6. Who invented Atomic numbers ?

Answer: Moseley of Britain in 1913

7. Who invented Blood Transfusion ?

Answer: Jean-Baptiste Denys of France in 1625.