There are several sites online that claim to read your mind. A typical scenario is as follows:
You pick a two-digit number, add the digits, and subtract that sum from your original number. You then look up this difference in a chart of numbers [from 0 to 99] and make note of the associated symbol. The site will then tell you what symbol you noted.
Magic on the Internet? A mathematical trick? See if you can figure it out (or post a comment if you need a hint!).
Tags: math magic; mindreading