Ever walked into a grocery store for milk and walked out with a cart full of stuff you didn't plan to buy? You're not alone. The thing is, most of us don't even realize we're being influenced. We ...

Have you ever heard of the “rule of three” when decorating? The rule of three in decorating suggests that items grouped in threes are more visually appealing and natural than those grouped in even ...

Do celebrities really die in three? Actor Malcom-Jamal Warner, singer Ozzy Osbourne and professional wrestler Hulk Hogan died in late July, prompting Google search around the “rule of three” to spike.