Valve, in partnership with Aperture Science, present the second video in the "investment opportunity" series, explaining why robots like P-body and Atlas are six seconds better than humans when it comes to cooperative multiplayer.

Take it from Aperture Science CEO Cave Johnson. Humans cannot be trusted. How many times have you found yourself dead in a cooperative multiplayer game, betrayed by the snickering human on the other end of your internet connection? One minute you're busy marveling over the wonder of panels, the next you're a cinder.

That's why Aperture Science uses robots.

Controlled by humans.

Portal 2 is due out April 19 for the PC, Xbox 360, and PlayStation 3.