... haven't they. Except for Lothar, who sensibly seems to stick with the same one. But damn it, it's a good one!
If I was doing my degree again, this time I would research something different. Addictive internet behaviour. I can only speak truly for myself here. Forums or chat are like having a magical newspaper on your coffee table. Where everytime you glance at it the headlines are different. The lure of looking continually is just too strong. Impossible to resist. I guess the ever changing mug-shots are part of the same mosaic. It's great isn't it.