1. Who invented HIV ?

Answer:

2. Who invented Ball-Point Pen ?

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

3. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

4. Who invented Atomic numbers ?

Answer: Moseley of Britain in 1913

5. Who invented Safety Pin ?

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

6. Who invented Diesel Engine ?

Answer: Rudoff Diesel of Germany in 1895

7. Who invented Atomic theory ?

Answer: Dalton of Britain in 1803.