It’s your first semester. Campus is crawling with nameless strangers. Totally invisible, you scan the chattering chaos—in a lame attempt to seem undaunted, you gaze down at your smartphone and wonder, “Will anyone like me? Why should I like any of them? How would I even know a real friend if I found one?” According to a recent study, there are three personality traits most likely to bring you and your new pal together: shared taste in music, resonant religious beliefs, and similar ethical views. If a person shares all three traits, you may become best buds forever. If they share none of these, you might want to go back to your smartphone.

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