1. Who invented Ball-Point Pen ?

Answer: John J. Loud of U.S.A. in 1888

2. Who invented Atomic numbers ?

Answer: Moseley of Britain in 1913

3. Who invented DNA Structure ?

Answer: Crick(UK), Waston(US), Wilkins(UK) in 1951

4. Who invented Safety razor ?

Answer: King Camp Gillette of U.S.A. in 1903

5. Who invented Open Heart Surgery ?

Answer:

Dr. Daniel Hale Williams

6. Who invented Piano ?

Answer:

Bartolomeo Cristofori

7. Who invented Bleaching Powder ?

Answer: Tennant of Britain in 1798