1. Who invented Vitamin D ?

Answer:

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

2. Who invented Atomic numbers ?

Answer: Moseley of Britain in 1913

3. Who invented Neon Lamp ?

Answer:

Georges Claude who was a French engineer, chemist and inventor

4. Who invented Logarithms ?

Answer:

John Napier (Scotland) invented Logarithm

5. Who invented Bacteria ?

Answer: Leeuwenhock of Netherlands in 1683

6. Who invented Helicopter ?

Answer:

Igor Sikorsky

7. Who invented Steam Engine ?

Answer: Thomas Savery of Britain in 1698