User blog comment:900bv/The Zombies Storyline: Suddenly Interesting/@comment-3967954-20130707140823/@comment-1045586-20130707142943

The game says that. Green Run takes place in the 1960s, there is a robotic bus driver.

Oh, and another thing that isn't fully explained, what is the Avogadro? I remember somebody coming up with the ludicrous idea that it is The Weasel, which is obviously not true, but it's origins were never really explained.