Google Ad(non)sense

I’m still trying to reverse engineer the AdSense algorithm. At the moment (23:26, Monday December 12, 2005), all four ads placed by Google on this page are for fire or burglar alarms. Yet nothing even remotely connected to these has appeared on the Blog. Hmmmm… Could it possibly be that when it can’t find any relevent ads, it just, well, picks ones at random? Surely not.