1. Who invented Printing Press ?

Answer:

Johannes Gutenberg

2. Who invented Open Heart Surgery ?

Answer:

Dr. Daniel Hale Williams

3. Who invented Transistor ?

Answer: Bardeen, Shockley & Britain of U.S.A. in 1948

4. Who invented Piano ?

Answer:

Bartolomeo Cristofori

5. Who invented Penicillin ?

Answer: Alexander Fleming of Britain in 1928.

6. Who invented Bacteria ?

Answer: Leeuwenhock of Netherlands in 1683

7. Who invented Transformer ?

Answer:

Ottó Bláthy