1. Who invented Calculus ?

Answer: Newton of Britain in 1670.

2. Who invented paper ?

Answer:

Cai Lun

3. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

4. Who invented Transformer ?

Answer:

Ottó Bláthy

5. Who invented Atomic numbers ?

Answer: Moseley of Britain in 1913

6. Who invented Printing Press ?

Answer:

Johannes Gutenberg

7. Who invented HIV ?

Answer: