1. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

2. Who invented Telescope ?

Answer: Hans Lippershey of Netherlands in 1608.

3. Who invented Proton ?

Answer:

Ernest Rutherford

4. Who invented Bleaching Powder ?

Answer: Tennant of Britain in 1798

5. Who invented Open Heart Surgery ?

Answer:

Dr. Daniel Hale Williams

6. Who invented Air Conditioning ?

Answer:

Willis Carrier in 1902

7. Who invented Vitamin A ?

Answer: Mc Collum and M.Davis of U.S.A. in 1913