Who invented the rabies vaccine?

Persons suffering from myopia are advised to use

The density of milk can be measured by?

The theory of origin of life on earth is proposed by: 

The major component of Honey is?

Light year is a unit of 

A yellow dust appears on the fingers, whenever we touch the middle of a flower. These tiny yellow grains are one of the most precious substances in nature because they contain the secret of plant life.  What is this dust called?

Where is urea manufactured?