I had a bad day today too, so it must be in the air! How old are the biters? It is pretty common and normal for toddlers to bite. I have a couple of biters in my daycare now and I have to watch them like a hawk and take them with me if I leave the room. Time-outs are given as well, but I have never found them to be very effective for biting. At the age they are, I think it normal...not terminating worthy unless combined with other factors. Chin up! Relax and breath. It is not the end of the world...these things happen. My own son once bit another child and drew blood in his daycare...and he was not a biter!