This free course was written by Keir Irwin-Rogers. It was first published in April 2020.
Except for third party materials and otherwise stated (see Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence.), this content is made available under a
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Figure 1: © Orbon Alija/E+/Getty Images
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Figure 5: © Artem Oleshko/123RF
Videos 1–4, 6–9: © The Open University
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