In the interest of saving space, I’m limiting this list to those I didn’t mention last time. My thanks to: Terese Nielsen for great paintings, Jie Yang for the production work on the cover, and Jaana Mattson for the maps. Robert Stauffer and Allison Lindon for proofreading, Erin Bekowies and Becker Strout for cold reading. Jennifer Lattanzio and Adrian Wood for their work on Newton’s Cannon. Shelly Shapiro—who should have been mentioned long before now— Christopher Schluep, Ann Hoang, and Tim Kochuba. Eleanor Lang, for keeping me safe on the road. William Ridout—my uncle—for his expert knowledge on the crafting, use, and history of black powder weapons. And for sneaking me black powder now and then when I was a kid… A CALCULUS OF ANGELS The instructors and fencers at Salle Auriol Seattle, and especially my foil coach, Charles Sheffer. Thanks also to Marshall Hibnes and Allen Evans for their comments and opinions on eighteenth-century fencing, my cadre mates Bobby Cortez, Mel Gregory, Adam Herbst, and Zabette Macomber—and of course to our Maitre d’Arms, Leon Auriol.