This free course was written by Emily Chambers. It was first published in July 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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Course image: © stevanovicigor; iStockphoto.com
Figure 1: © DEA / A. DAGLI ORTI; Alamy
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