Yin and yang
The Taijitu (太极图), more commonly referred to as Yin and Yang, is a Chinese symbol originating from a Chinese belief system called Taoism. It is supposed to represent the idea that everything in nature should be viewed as part of a whole, and that opposites are complementary forces that balance themselves out.
The symbol has two colors, White (Yang) and Black (Yin), each with the opposite color inside them that represent the above mentioned concepts. Some examples (written Yang=>Yin) are: Light-Dark, Male-Female, Expansion-Contraction, Up-Down, Sun-Moon, and Activity-Rest. The fact that both Yin and Yang contain the seed of their opposite means that Yin can become Yang, and Yang can become Yin. Night takes place of Day, and vice versa. What goes up, comes down. Males have estrogen, a hormone heavily associated with females, and females contain testosterone, which is associated with men. When people see beauty, ugliness is created to compare against the beauty. The main point of Yin and Yang is that everything contains its opposite, and everything must be balanced.
This logic also applies to humans. It tells us that we must live our lives in moderation. We mustn't have too much or too little of something. An example of this is food. If we have too little food, we starve to death, but if we have too much food, we risk heart attacks and strokes. If a ruler has too much assertiveness, the kingdom becomes a dictatorship full of suffering. Too much submission and crime can run rampant. If you exercise and don't rest, your body wouldn't be able to handle it. If you rest and never exercise, your body will remain unfit. Everything should be done in moderation.
Science, too, has foundation in Yin and Yang. A magnet wouldn't be a magnet without both the north and south poles. Protons are Yang, while electrons are Yin. Within our DNA,the nitrogenous bases, A, C, G and T also represent Yin and Yang.There is an equal amount of A to T in a strand of DNA, as there is an equal amount of C to G in DNA.
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