This book selects a total of 18 classic effects and laws, such as the butterfly effect, Wallach effect, Matthew effect, catfish effect, herd effect, domino effect, horsefly effect, kicking cat effect, Pyramid effect, broken window effect, halo effect, Rainier effect, 80/20 rule, barrel law, Washington law of cooperation, Parkinson's law, etc., Covering all aspects of life. Facts have repeatedly proven that they are unspoken rules that silently play an important role in this world! In the palace of human civilization, their status may not be prominent, but they really affect our lives!