Science Mysteries: Why Do People Yawn? Science has given humans many amazing devices and useful bits of knowledge. We know so much about our bodies and how to stay healthy, for example. We also know how to make machines and devices that make life easy for us. Scientists dedicate their lives to knowledge, but even with a lifetime commitment, sometimes scientists fail to find all the answers. One mystery that still remains unsolved is why we yawn—what makes us yawn and what purpose it serves.

Recent studies suggest that we yawn when we get tired as a way to encourage our brains. The theory is that yawning helps cool the brain, allowing it to work more efficiently. According to WebMD's article about these studies, when you yawn, your jaw muscles get stretched, increasing blood flow to your neck, face, and head. Also a deep breath during the yawn forces spinal fluid and blood down from the brain. The cool air then cools down these fluids.

Other scientists believe, however, that yawning is a form of communication. This theory attempts to explain why yawning seems to spread from person to person. This kind of behavior is called "contagious yawning" and carries with it a possible social message. Scientists are not yet sure what exactly the message is, but they believe people who have more social empathy are more likely to start yawning when they see someone else yawning.

Scientists will continue to investigate the mystery of the yawn. Is it a leftover behavior from before humans had language? Was it a "Hey, I'm sleepy. Let's go to sleep" message? Or is it really just a way to keep our brains cool? While this behavior still is largely a mystery, one thing is certain: you are probably fighting the urge to yawn right about now.

Which word from the text best describes scientists' understanding of the yawn?

Mystery
Breath
Language
Message

Select the correct answer. read this excerpt from leo tolstoy's the death of ivan ilyich: her attitude towards him and his diseases is still the same. just as the doctor had adopted a certain relation to his patient which he could not abandon, so had she formed one towards him—that he was not doing something he ought to do and was himself to blame, and that she reproached him lovingly for this—and she could not now change that attitude. "you see he doesn't listen to me and doesn't take his medicine at the proper time. and above all he lies in a position that is no doubt bad for him—with his legs up." she described how he made gerasim hold his legs up. the doctor smiled with a contemptuous affability that said: "what's to be done? these sick people do have foolish fancies of that kind, but we must forgive them. . " they all rose, said good-night, and went away. when they had gone it seemed to ivan ilyich that he felt better; the falsity had gone with them. but the pain remained—that same pain and that same fear that made everything monotonously alike, nothing harder and nothing easier. everything was worse. again minute followed minute and hour followed hour. everything remained the same and there was no cessation. and the inevitable end of it all became more and more terrible. based on the excerpt, how is praskovya fedorovna a character foil to ivan ilyich? a. she is kind and takes care of ivan, which is why he feels guilty about how he treated her for most of their married life. b. she is vindictive toward ivan while pretending to be worried about him, thus reminding him of how his family has never forgiven him. c. she plays the part of the worried wife without any real feeling, symbolizing the false propriety ivan upheld but now hates. d. she is young, healthy, and beautiful—everything ivan can never be again and wishes he could return to. reset next

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The latin phrase de gustibus non est disputandum means which of the following? a. “disputes aren’t easily settled.” b. “the great aren’t guilty.” c. “guilt isn’t the issue.” d. “there’s no disputing about tastes.”