I asked myself that question when I was looking on the baby chicks forum, and now I've wandered over here. Now I know how to tell a fertile egg from an unfertile one, thank you! Every time I crack one open, I think, there....could have incubated that one. And then I read the thread on the Bra Incubator and briefly entertained that wild idea. So, my next purchase is going to be a small incubator (not a sports bra ). What brand incubator do you recommend? I only want a small one for a dozen or so eggs.