User:Aadhibandi225

STORY OF MICRO-ORGANISM
Why do we add some drops of butter milk to lukewarm milk to make curd ? why does even cooked food get spoiled after some days? why do we get bad smell from our mouth after we wake up early in the morning? in this chapter we will try to find out what may be involved in causing such changes. 400 years ago several people wondered over such questions and tried to find out answers.