1. Who invented Steam Engine ?

Answer: Thomas Savery of Britain in 1698

2. Who invented Vitamin D ?

Answer:

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

3. Who invented Gramophone ?

Answer:

Emile Berliner in 1887.

4. Who invented Radiocarbon ?

Answer:

Willard Libby

5. Who invented DNA Structure ?

Answer: Crick(UK), Waston(US), Wilkins(UK) in 1951

6. Who invented HIV ?

Answer:

7. Who invented Piano ?

Answer:

Bartolomeo Cristofori