51

　　, you would see plenty of animals with people running after them. Life for ancient people’s earned to center on hunting and gathering wild foods for meals.

　　In modern times, when food is available in grocery stores, finding love is more

　　52

　　in people’s lives. The

　　53

　　is all around us. It is easy to prepare a list of modern stories having to do with love. An endless number of books and movies qualify as love stories in popular culture.

　　Researchers are studying whether love, a highly valued emotional state, can be

　　54

　　. They ask, what is love? Toothpaste companies want us to think attraction is all about clean teeth, but clean teeth go only so far. Scientists wonder how much the brain gets involved. You have probably heard that opposites attract but that

　　55

　　attract, too. One thing is certain: The truth about love is not yet set in stone.

　　First Impression

　　To help determine the

　　56

　　of attraction, researchers paired 164 college classmates and had them talk for 3, 6 or 10 minutes so they could get a sense of each other’s individuality. Then students were asked to

　　57

　　what kind of relationship they were likely to build with their partners. After nine weeks, they reported what happened.

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