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Cartoons (Sections 1.4, 1.5, 2.1 and 3.5) : copyright © S. Harris
Cartoon (Section 3.4) : CartoonStock.com © Dan Rosandich
Mars orbiter : NASA
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OpenLearn - Rounding and estimation Except for third party materials and otherwise, this content is made available under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence, full copyright detail can be found in the acknowledgements section. Please see full copyright statement for details.