Rewind back in time to your elementary school days. More specifically, think back to that super confidential top secret that you just had to tell your best friend − no, this couldn’t wait until recess! How would you reveal that you "have a crush on the new girl in school" or that your friend should "come over to play this afternoon" when said friend is sitting far across the room? How could you communicate with friends without a teacher, classmate, or your crush (gasp!) intercepting that secret message? Elementary school communications involved mirror writing, Pig Latin, and the occasional invisible ink; regardless of the complex method employed, the secret message was considered a success when it reached the friend safely.