Superstitious means believing that certain actions, objects, or events can cause good or bad luck in ways that have no logical connection. A superstitious person might refuse to walk under a ladder, worry that breaking a mirror brings seven years of bad luck, or insist on wearing lucky socks before every game.

Superstitions are different from careful planning or following proven cause and effect. If you study hard for a test, that actually improves your chances of doing well. But if you think sitting in a particular chair will make you do better, that's superstitious thinking. The chair has no real power over your performance.

Many superstitions come from old traditions or cultural beliefs passed down through generations. Some people knock on wood after saying something good, hoping to avoid jinxing themselves. Others believe that Friday the 13th is unlucky, or that finding a four-leaf clover brings good fortune.

Being a little superstitious is common and usually harmless. Problems arise when superstitions control someone's life, making them afraid to do ordinary things or preventing them from thinking clearly about real causes and effects. Scientists and skeptics point out that superstitions confuse correlation with causation: just because two things happened at the same time doesn't mean one caused the other.