I forgot to mention in the previous post that water in the clay will also make it explode. Same reason--it heats up and wants to escape. Aaaand having an even thickness like I was talking about helps the clay DRY evenly.
I may not be updating on this blog for a few weeks because at about 2:30 this morning I decided I'm going on a little trip! I'll be in Iowa for a few weeks. So actually I may update because part of the reason I'm going to Iowa is to participate in a faculty/alumni ceramics show at Indian Hills Community College in Ottumwa where I went to school.