Justin always tries the first solution he thinks of when fixing things. Last week, his gadget stopped working, so he immediately changed its batteries. When that didn’t help, he got frustrated and didn’t try checking the wiring. He believed his first guess was right, even though other problems were possible. This happens a lot—when people test only the easiest guess, they miss real answers. Why do we do this instead of checking all the possibilities? Take the quiz to find out what’s really going on here.