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p. 1 (top): courtesy of the McGregor Museum, Kimberley, South
Africa. Bone photograph © F. D’Errico and L. Backwell/McGregor
Museum/Andy Pilsbury. Digital editor: Jen O’Shaughnessy.
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p. 1 (bottom left and right): courtesy of the Clockmakers’
Museum (at the Science Museum, London, UK).
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p. 2 (top and bottom): courtesy of the Ashmolean Museum,
Oxford, UK.
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p. 5 (top and bottom): courtesy of the Clockmakers’ Museum
(at the Science Museum, London, UK).
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p. 6: courtesy of the Museum of Timekeeping, Newark,
UK.
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p. 7 (top and bottom): by permission of James
Dowling.
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p. 8: by permission of Kevin Carter
(@kccarter1952).