This book is licensed under CC BY-NC-SA 4.0 International. You are free to share, copy, and redistribute the material in any medium or format as well as to adapt, remix, transform, and build upon the material under the following terms: (1) you must give appropriate credit, (2) you may not use the material for commercial purposes, (3) if you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original, (4) you may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.
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Main cover picture by Agence Olloweb.