Educators are finding new ways to capture the attention and imagination of students in the class room, and some have begun to incorporate video games such as Portal and Portal 2 to help teach phsyics and critical-thinking skills. Valve wants to help, so they are giving Portal away for free until September 20.
Of course, if you’re not a student and you haven’t played Portal (you monster) you owe it to yourself to download the game. You’re never too old to learn that the cake is a lie.
Source: Learn With Portals