Valve, today, released a new video in their "Aperture Investment Opportunity" video series. The 4 in the series, called "Boots," details the life-saving qualities said boots will display in Portal 2.
Anyone who played the first one probably spent the majority of the game spending part of their time trying to figure out exactly what purpose those things on protagonist Chell's feet were. (Or was that just me?)
Now we (I) know for sure.
Check out that video and all the others in the Aperture Investment Opportunity series right now.