RIP in Peace to Mr. Thag Simmons, without whom, we would never have determined a name for those big spikes at the end of a Stegosaurus's tail. Sure, it's not the claim to fame that anyone of us dreamed for Thag. We wish it could have been something else. Maybe we could have named a beautiful butterfly after him. But instead, rather horrifically, we have the Thagomizer. Don't worry, Thag. Your grisly death will not have been in vain. In fact, it lead to a moderate amount of scientific advancement. This next generation of caveman knows to stay a little bit further away from those tails.