1. Who invented Atomic numbers ?

Answer: Moseley of Britain in 1913

2. Who invented DNA Structure ?

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

3. Who invented Ball-Point Pen ?

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

4. Who invented Barometer ?

Answer: Evangelista Torricelli of Italy in 1644

5. Who invented watch ?

Answer:

Peter Henlein invented the first portable time piece in 1504

6. Who invented Laser ?

Answer:

Charles H. Townes

7. Who invented Stethoscope ?

Answer: Laennec of French in 1819.