1. Who invented Vitamin D ?

Answer:

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

2. Who invented Aeroplane

Answer: Orville & Wilbur Wright in 1903

3. Who invented Aspirin ?

Answer:

Felix Hoffmann invented Aspirin

4. Who invented Circulation of blood ?

Answer: William Harvey of Britain in 1628

5. Who invented Bicyle ?

Answer: Kirkpatrick Macmillan of Britain.

6. Who invented X-ray ?

Answer: W.K. Roentgen of Germany in 1895.

7. Who invented Chemotherapy ?

Answer: Paracelsus of Switzerland