Relativity
The law of relativity, founded by Einstein is one important Physics law which underpins the principles of Science. In life, I believe this law is also applicable. Man often gets a sense of meaning through relativity. In short, this relativity stems from the comparison with others. Man often focuses on what others have that we do not have and feel a sense of regret or sadness. But at the same time, man does not treasure what he has until the time that he loses it. Then, it is late to regret.