The stories in this book were much improved by and so owe much to the following sources: Jenny Uglow’s The Lunar Men; Maria Edgeworth’s Memoirs of Richard Lovell Edgeworth, Esq.; Anna Seward’s Memoirs of the Life of Dr. Darwin; Elaine Sciolino’s “Magic Measured in a Pile of Salt”; Tom Vanderbilt’s “Let the Robot Drive: The Autonomous Car of the Future Is Here”; Burkhard Bilger’s “Auto Correct: Has the Self-Driving Car at Last Arrived?”; Joe Palca’s “The Scientist Who Makes Stars On Earth”; Alec Wilkinson’s The Ice Balloon: S.A. Andree and the Heroic Age of Arctic Exploration; Apsley Cherry-Garrard’s The Worst Journey in the World; Anthony Brandt’s The Man Who Ate His Boots: The Tragic History of the Search for the Northwest Passage; Chauncey Loomis’s Weird and Tragic Shores: The Story of Charles Francis Hall, Explorer; Ken McGoogan’s Fatal Passage: The Story of John Rae, the Arctic Hero Time Forgot; John Robert Christianson’s On Tycho’s Island: Tycho Brahe, Science, and Culture in the Sixteenth Century; Kitty Ferguson’s Tycho and Kepler: The Unlikely Partnership That Forever Changed Our Understanding of the Heavens; Joshua and Anne-Lee Gilder’s Heavenly Intrigue: Johannes Kepler, Tycho Brahe, and the Murder Behind of One of History’s Greatest Scientific Discoveries; Andrew Chaikin’s A Man on the Moon; Alan Bean’s My Life as an Astronaut; and, of course, Wikipedia.