1. Who invented X-ray ?

Answer: W.K. Roentgen of Germany in 1895.

2. Who invented paper ?

Answer:

Cai Lun

3. Who invented Open Heart Surgery ?

Answer:

Dr. Daniel Hale Williams

4. Who invented Telescope ?

Answer: Hans Lippershey of Netherlands in 1608.

5. Who invented Transformer ?

Answer:

Ottó Bláthy

6. Who invented Calculus ?

Answer: Newton of Britain in 1670.

7. Who invented Aeroplane

Answer: Orville & Wilbur Wright in 1903