Acknowledgements

Many thanks for comments, ideas, and text from Harald Alvestrand, Richard Barnes, Adam Bergkvist, Alissa Cooper, Benoit Claise, Spencer Dawkins, Gunnar Hellström, Christer Holmberg, Cullen Jennings, Paul Kyzivat, Eric Rescorla, Adam Roach, Irene Rüngeler, Randall Stewart, Martin Stiemerling, Justin Uberti, and Magnus Westerlund.