1. Who invented Calculus ?

Answer: Newton of Britain in 1670.

2. Who invented Neon Lamp ?

Answer:

Georges Claude who was a French engineer, chemist and inventor

3. Who invented HIV ?

Answer:

4. Who invented Safety Pin ?

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

5. Who invented Locomotive ?

Answer:

George Stephenson was first to buit steam locomotives.

6. Who invented Radar ?

Answer:

Sir Robert Watson-Watt

7. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist