The thing is, experiments have conclusively disproven that theory over the years. In fact, there is no universally agreed upon theory for why we actually yawn, even though everyone does it. A commonly accepted theory is that yawning actually cools down the brain, because various experiments have shown that one of the few things to actually change in the body during a yawn is the temperature of the brain itself.
可事实是,这些年来,实验已经完全否定了这一理论。实际上,尽管每个人都会打哈欠,可关于我们打哈欠的原因仍没有普遍认同的理论。一种人们广为接受的理论称打哈欠事实上能使大脑的温度下降,因为各种各样的实验已经说明当人打哈欠时,人体为数不多的变化之一就是大脑自身温度的下降。
As for why yawning is contagious, no one knows that either.
至于打哈欠为什么会传染,也没有人知道原因。
4 Left And Right Have Been Confusing Philosophers For Years
4 “左”与“右”的问题已困扰哲学家们多年
How would you explain the concept of left and right to someone who had no idea what those words meant? Would you explain it in terms of your relative position to a well-known stationary landmark? Or maybe you’d think outside the box and refer to the rotation of the Earth or something comparably massive and unchanging. But what if you were talking to an alien whose planet rotated differently to our own, or one who didn’t have eyes? It’s a question that has been intriguing philosophers for years because, without an agreed upon point of reference, it’s incredibly difficult to define what left and right actually are.For example, consider the work of German philosopher Immanuel Kant, who once said, “Let it be imagined that the first created thing were a human hand, then it must necessarily be either a right hand or a left hand.”
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