1. Who invented Safety Pin ?

Answer: Walter Hunt of U.S.A. in 1849

2. Who invented Transformer ?

Answer:

Ottó Bláthy

3. Who invented Vitamin B1 ?

Answer:

Casimir Funk discovered in 1912

4. Who invented Vitamin D ?

Answer:

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

5. Who invented Bacteria ?

Answer: Leeuwenhock of Netherlands in 1683

6. Who invented Radar ?

Answer:

Sir Robert Watson-Watt

7. Who invented Logarithms ?

Answer:

John Napier (Scotland) invented Logarithm