This free course was written by Louise MacBrayne. It was first published in February 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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Figure 1: left image: Jongleur; right image: misterkong/https://creativecommons.org/licenses/by-sa/3.0/deed.en
Figure 6: © sylv1rob1/Getty Images
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