3. A good illustration of how scientific discoveries may be made accidently is the discovery of penicillin.
Alexander Fleming was a bacteriologist who for 15 years had tried to solve the problem of how to get rid of the disease carrying germs or microbes in the human body without causing any dangerous side effects.
Fleming was an untidy worker and often had innumerable small dishes containing microbes all around his laboratory.
One day, one of the dishes was contaminated with a mould, due to the window having been left open.
Fleming noticed that the mould had killed off the microbes, and it was from similar moulds that the miracle drug penicillin was finally developed.
Of course, only a brilliant scientist like Fleming would have been able to take advantage of this stroke of luck, but the fact remains that the solution to his problem was given to him literally on a plate.
4. What I want to emphasize to you is this, that people remember things which make sense to them or which they can connect with something they already know.
Students who try to memorize what they cannot understand are almost certainly wasting their time.