I heard “laurel.” But my coworker heard “yanny.” Welcome to “the dress” debate of 2018.

If you were on Twitter today, you also likely heard the viral four-second audio clip that, depending on the listener, sounded like one word or the other—or in some cases, both. So what weird trick of the human body is making people hear two different words from the same audio file?

Experts say it comes down to the frequencies we hear and, perhaps more importantly, the frequencies we expect to hear.

The three lowest frequencies are used to encode language as a sound wave. The third frequency distinguishes between l and r. This frequency is high for l, like at the beginning and end of "laurel,"