Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.

Q: Context: Many people have problems with their vision, or ability to see. Often, the problem is due to the shape of the eyes and how they focus light. Two of the most common vision problems are nearsightedness and farsightedness, which you can read about below. You may even have one of these vision problems yourself. Usually, the problems can be corrected with contact lenses or lenses in eyeglasses. In many people, they can also be corrected with laser surgery, which reshapes the outer layer of the eye. Click image to the left or use the URL below. URL: Nearsightedness, or myopia, is the condition in which nearby objects are seen clearly, but distant objects appear blurry. The Figure 1.1 shows how it occurs. The eyeball is longer (from front to back) than normal. This causes images to be focused in front of the retina instead of on the retina. Myopia can be corrected with concave lenses. The lenses focus images farther back in the eye, so they fall on the retina instead of in front of it. Q: Sometimes squinting the eyes can help someone see more clearly. Why do you think this works? A: Squinting may improve focus by slightly changing the shape of the eyes. When you squint, you tighten muscles around the eyes, putting pressure on the eyeballs. Farsightedness, or hyperopia, is the condition in which distant objects are seen clearly, but nearby objects appear blurry. It occurs when the eyeball is shorter than normal (see Figure 1.2). This causes images to be focused in a spot that would fall behind the retina (if light could pass through the retina). Hyperopia can be corrected with convex lenses. The lenses focus images farther forward in the eye, so they fall on the retina instead of behind it. Q: Joey has hyperopia. When is he more likely to need his glasses: when he reads a book or when he watches TV? A: With hyperopia, Joey is farsighted. He can probably see the TV more clearly than the words in a book because the TV is farther away. Therefore, he is more likely to need his glasses when he reads than when he watches TV.
Question: in hyperopia, the eyeball is

A: shorter than normal.
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Q: Context: A physical change in matter is a change in one or more of matters physical properties. Glass breaking is just one example of a physical change. Some other examples are shown in Figure 3.16 and in the video below. In each example, matter may look different after the change occurs, but its still the same substance with the same chemical properties. For example, smaller pieces of wood have the ability to burn just as larger logs do. MEDIA Click image to the left or use the URL below. URL: Because the type of matter remains the same with physical changes, the changes are often easy to undo. For example, braided hair can be unbraided again. Melted chocolate can be put in a fridge to re-harden. Dissolving salt in water is also a physical change. How do you think you could undo it? Did you ever make a "volcano," like the one in Figure 3.17, using baking soda and vinegar? What happens when the two substances combine? They produce an eruption of foamy bubbles. This happens because of a chemical change. A chemical change occurs when matter changes chemically into an entirely different substance with different chemical properties. When vinegar and baking soda combine, they form carbon dioxide, a gas that causes the bubbles. Its the same gas that gives soft drinks their fizz. Not all chemical changes are as dramatic as this "volcano." Some are slower and less obvious. Figure 3.18 and the video below show other examples of chemical changes. MEDIA Click image to the left or use the URL below. URL: How can you tell whether a chemical change has occurred? Often, there are clues. Several are demonstrated in Figures 3.17 and 3.18 and in the video below. MEDIA Click image to the left or use the URL below. URL: To decide whether a chemical change has occurred, look for these signs: Gas bubbles are released. (Example: Baking soda and vinegar mix and produce bubbles.) Something changes color. (Example: Leaves turn from green to other colors.) An odor is produced. (Example: Logs burn and smell smoky.) A solid comes out of a solution. (Example: Eggs cook and a white solid comes out of the clear liquid part of the egg.) Because chemical changes produce new substances, they often cannot be undone. For example, you cant change a fried egg back to a raw egg. Some chemical changes can be reversed, but only by other chemical changes. For example, to undo the tarnish on copper pennies, you can place them in vinegar. The acid in the vinegar reacts with the tarnish. This is a chemical change that makes the pennies bright and shiny again. You can try this yourself at home to see how well it works. If you build a campfire, like the one in Figure 3.19, you start with a large stack of sticks and logs. As the fire burns, the stack slowly shrinks. By the end of the evening, all thats left is a small pile of ashes. What happened to the matter that you started with? Was it destroyed by the flames? It may seem that way, but in fact, the same amount of matter still exists. The wood changed not only to ashes but also to carbon dioxide, water vapor, and other gases. The gases floated off into the air, leaving behind just the ashes. Assume you had measured the mass of the wood before you burned it. Assume you had also trapped the gases released by the burning wood and measured their mass and the mass of the ashes. What would you find? The ashes and gases combined have the same mass as the wood you started with. This example illustrates the law of conservation of mass. The law states that matter cannot be created or destroyed. Even when matter goes through physical or chemical changes, the total mass of matter always remains the same. (In the chapter Nuclear Chemistry, you will learn about nuclear reactions, in which mass is converted into energy. But other than that, the law of conservation of mass holds
Question: After a physical change, matter may

A: look different.
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Q: Context: Michael (John Travolta) is not a stereotypical archangel. He epitomizes the freedom that an angel might command if living among mere mortals. As the tagline says, "He's an angel, not a saint."Two reporters, Frank Quinlan (William Hurt) and Huey Driscoll (Robert Pastorelli), one cynical and the other innocent, work for a tabloid newspaper in Chicago. ("Quinlan" is a nod to one of the writers of the same name.) They travel to a sleepy hamlet in Iowa because Quinlan has received a letter from a woman, Pansy Milbank, (Jean Stapleton) who has an angel for tenant and he is able to convince his editor (Bob Hoskins) that they should visit her at the Milk Bottle Motel. She dies before their very eyes, and they "persuade" Michael to accompany them to Chicago. Traveling with them is an alleged angel expert, Dorothy Winters (Andie MacDowell) with whom they were saddled by their editor.Michael is in control of the entire trip. They stop when he says so because he causes their tire to go flat. He leads them in a fight in a bar for which they are jailed one night. And he resurrects the dog, Sparky, after it is runover by a truck.Throughout the story, there is romantic tension between the angel expert and Quinlan, the cynical reporter and Michael engineers their romance to the very end.The movie's climax comes when they finally arrive in Chicago and Michael breathes his last looking up at the Sears Tower. (Michael has a fascination for the biggest and tallest things in the world.) Michael wasn't dying; but he was exiting earth for his last time. Meanwhile, the angel expert is exposed as a spy for the manipulative editor, and she confesses that she was after Huey's job. In truth, she is a dog expert who was sent on the trip to befriend Sparky. Quinlan, who at one point was moving out of his cynicism, regresses and the story almost ends with the three traveling companions going their separate ways, knowing they had journeyed with an angel, but not understanding exactly what it meant.Finally, one night, Quinlan spots a figure that he thinks is Michael (who was lying about it being his last visit), and begins following him rapidly through the streets. He rounds one corner and careens into Dorothy, who apparently was following a Michael-clone herself. Their faith is restored, and their love blossoms once more. "Marry me, Dorothy," says Quinlan. "Yes," she replies. Then the scene freezes, and out pop Michael and Pansy Milbank -- we're left to ponder whether she became an angel when she died earlier, or that she was an angel all along -- and they dance through the frozen people until they merge with the light emanating from a car's headlights.
Question: What is Michael?

A:
an angel
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