This free course was written by Maria Velasco-Garcia and adapted by Nicolette Habgood.
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115685 Figure 1a: © Juangonzalez64
115686 Figure 1b: © Hawyih
213984 Figure 2: Moving Moment / Shutterstock
232138 Figure 8: Charles D Winters / Photo Researchers / Universal Images Group
213977 Figure 12a: Kim Traynor This file is licensed under a Creative Commons CC 2.0 license
213978 Figure 12b: Nieuwland Photography / Alamy Stock Photo
213979 Figure 12c: vsoldatov5 / Shutterstock
213980 Figure 12d: blickpixel / Pixabay
213981 Figure 12e: Cristina Pedrazzini / Science Photo Library / Universal Images Group
213982 Figure 12f: LAWRENCE LIVERMORE NATIONAL LABORATORY / SCIENCE PHOTO LIBRARY (NOT CLEARED)
106373 Figure 13: Richard Treptow / Photo Researchers / Universal Images Group
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