What fun was it without having me around?
出自北齐·颜之推《颜氏家训·文章》。书写文章要尊崇“三易”的原则，即文章内容要清晰明了，这是第一项。书写的文字要简单概要，这是第二项。书写的段落要读起来朗朗上口这是第三项。
In the realm of quantum mechanics, the observer becomes a part of the experiment, altering the outcome by the mere act of observation.