This free course was written by Caroline Heaney. It was first published in August 2019.
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: marino bocelli; Shutterstock
Figure 1: ALPA PROD; Shutterstock
Figure 5: PeopleImages; Getty Images
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