1. Who invented Aeroplane

Answer: Orville & Wilbur Wright in 1903

2. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

3. Who invented Television ?

Answer:

John Logie Baird

4. Who invented Vitamin D ?

Answer:

Edward Mellanby discovered Vitamin D while researching a disease called rickets in 1922

5. Who invented Open Heart Surgery ?

Answer:

Dr. Daniel Hale Williams

6. Who invented Stethoscope ?

Answer: Laennec of French in 1819.

7. Who invented Relativity Theory ?

Answer: Einstein of Germany in 1905.