Hi, one of the best sciences is the medicine science because it can save people's life and what is better than helping the people to become healthy again and saving their life. Now a day disease are much more under control than past, may be in the past a simple infection caused to death because there were no strong enough drug to prevent infection. They in the best way tried to use some herbs. so that discovery for stopping infection was a great happening and it happened by Alexander Fleming in 1928. Let's watch the video about Alexander Fleming and discovery of penicillin.