Some of you may have seen (or more precisely, heard) the new audio clip going around where some people hear the computer voice saying "Laurel" while others hear "Yanny".
The reason that some people hear a different word than you is all in the frequencies. You see, both words are actually in that audio and depending on which frequencies you hear, you will either hear one or the other.
Now, this can be affected by your speakers... good bass speakers will have you hearing "Laurel" while $5 headphones might make you hear "Yanny."
But this can also be affected by who you are. Children and even some women will hear higher frequencies than men do, usually. It's just genetics. As you get older, your hearing won't pick up the super high or super low frequencies anymore, especially for men. This means that kids and some women might hear the "Yanny" in the higher frequencies will most men will hear "Laurel" in the lower frequencies.
Still not convinced? Check out this video and see if it helps you to hear both: