Recently our conversation at the dinner table turned to stem cells - and how they can be used in various ways to treat diseases and provide therapy. It must have been a topic in science class that day, as one of the boys mentioned that some researchers had been able to reprogram adult cells to revert to stem cells in living mice. But noted that they haven't been able to fully control the process just yet.Without missing a beat, the other son contributed, "Yeah. And that's too bad. Cuz the mouse has five legs now." And he chuckled at his wise crack.Also without missing a beat, I responded saying, "That's no big deal. I have four arms!" When they looked at me with eyes that said, Yeah, mom. Whatever, I quickly pushed my sleeves up and presented my forearms.Their eyes rolled and their chuckling stopped immediately. But I sure got a good laugh out of it. Fore-arms. Four arms? Get it???? Ahhhh, I crack myself up!