Chris writes about his upcoming travels:

One thing I’m going to try to do is visit some of the Aztec sites around Mexico city. I’d love to see the circular stone calendar if I can.

Dude: you are totally over-thinking the problem. There are much simpler calendars much closer at hand.

I’m traveling too. I’m off to Amsterdam at the end of the week. The jury is out on whether or not I will be blogging the trip. It all has to do with whether or not I have access to wifi and whether or not I have a digital camera with me. We shall see…