iPod Nano Pedometer

My brother-in-law got me a new iPod Nano for Christmas with a pedometer function, and I have been having so much fun with it on my runs. I have no idea how it works since there's no accelerometer on the device, but it's still fun to play with. It counts my runs at about 6000-8000 steps. Once I get back to school I'm going to try to remember to use it when I'm walking around campus, since I always have an iPod on anyway. I'll be interested to see how much walking I really do up and down the steps, because it certainly feels like a lot! I bet I'll be able to do 10,000 steps a day, easy.