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6 Acknowledgments

I would like to thank Giovanni Arcioni, John Barrow, Roman Jackiw, Nemanja Kaloper, Jorma Louko, and Vincent Moncrief for useful comments. This review is dedicated to the memory of Bryce DeWitt, who taught me, and the world, much of what we know about quantum gravity. This work was supported in part by Department of Energy grant DE-FG02-91ER40674.
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