One of the topics that always seems to grab students when we talk about privacy is the question of subdermal trackers. Digital Angel holds some patents on personal locators, and caused quite a stir when they announced that they were about to test subdermal versions of their devices. They quickly backed up on that, but it looks as though they have been quietly moving in that direction anyway. The public environment is likely much more inviting these days. Besides, we now have new creepy things to think about, like: robots that think like rats, rats with robot brains, and robots with rat brains.