You haven't thought about Temple Run in a little bit. That's ok, we haven't either. This megahit had its time in the sun, and barring a "Temple Run 3," there's not much reason to think we'll see it at the top of the App Store again any time soon.

But that doesn't mean it hasn't been accruing downloads all this time.

Imangi Studios has just announced that the game has been downloaded 1 billion times. To put that into perspective, there are 7.2 billion people on Earth. A billion downloads means one for every 7 people.

That's a lot of running.