This free course was written by Liz Smith. It was first published in May 2019.
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Course image: skynesher; iStockphoto.com
Figure 1: DGLimages; iStockphoto.com
Figure 2: Sean824; iStockphoto.com
Figure 3: Cn0ra; iStockphoto.com
Figure 4: Warchi; iStockphoto.com
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