When it comes to understanding speech, the world's top tech companies are still playing catch-up with children.

For those of you like me - the grammatically challenged - function words are the smallish words that tie our sentences together. The. This. Though. I. And. An. There. That. "Function words are essentially the filler words," Pennebaker says. "These are the words that we don't pay attention to, and they're the ones that are so interesting." According to the way that Pennebaker organizes language, the words that we more often focus on in conversation are content words, words like "school," "family," "live," "friends" - words that conjure a specific image and relay more of the substance of what is being discussed.