Your faith, weight, and sexual activity all come into play.

It's true, some of us are smarter than others. But why?

Many research studies have been conducted to determine why certain people have high IQs; genetics play a big role. Studies have found the way you look and what you believe can indicate your level of intelligence.

We pulled research from Fox News, CBS, Psychology Today, The Times and more to bring you 20 research-proven signs you're smart. Keep in mind, correlation does not equal causation!