1. Who invented HIV ?

Answer:

2. Who invented Laser ?

Answer:

Charles H. Townes

3. Who invented Bleaching Powder ?

Answer: Tennant of Britain in 1798

4. Who invented by Electric Lamp ?

Answer: Thomas Alva Edison of U.S.A. in 1879

5. Who invented Relativity Theory ?

Answer: Einstein of Germany in 1905.

6. Who invented Steam Engine (Piston)

Answer: Thomas Newcomen of Britain in 1712

7. Who invented Periodic table ?

Answer:

Dmitri Mendeleev invented Periodic Table