Penicillin

Penicillin is one of the most useful drugs invented by Alexander Fleming.

    With its help we can heal wounds caused by bacteria which can't otherwise be healed.  To begin with, very few people knew of this wonderful discovery and its uses. First scientists and then ministers of  governments got interested in it.
Penicillin could save the wounded soldiers, it could be helpful in war. Since

And so they all decided to encourage the process of its manufacture. Vast factories were set up for preparing it. Lives of hundreds of thousands of soldiers were saved with its help.

 Penicillin , when introduced into the stream of the human blood acts as an aid to those parts which are always fighting deadly germs. It does not have power over every kind of bacteria; but certain kinds are destroyed by Penicillin in great majority of cases.