1. Who invented Air Conditioning ?

Answer:

Willis Carrier in 1902

2. Who invented Relativity Theory ?

Answer: Einstein of Germany in 1905.

3. Who invented Open Heart Surgery ?

Answer:

Dr. Daniel Hale Williams

4. Who invented Submarine ?

Answer:

John Philip Holland

5. Who invented Helicopter ?

Answer:

Igor Sikorsky

6. Who invented Logarithms ?

Answer:

John Napier (Scotland) invented Logarithm

7. Who invented Bicyle ?

Answer: Kirkpatrick Macmillan of Britain.