It Has Been Written Episode 10 Table of Contents
In calculating the angle at which to launch the meteor, they accidentally turned a plus sign into a lowercase "t"
Tags:   Jean-Marc Nabinmath

Based on a true story. (You might quibble that the comic actually depicts a lowercase "t" getting turned into a plus sign, however, these aliens write math from the bottom of the page to the top. This was totally intentional and not at all an oversight on Jean-Marc's part.)