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Sources:
http://www.popsci.com/science/article/2012-11/fyi-what-maks-hair-curly
https://www.ncbi.nlm.nih.gov/pubmed/17919197
http://onlinelibrary.wiley.com/doi/10.1111/j.1365-4632.2007.03453.x/abstract
http://www.telegraph.co.uk/news/science/science-news/6751910/Curly-hair-gene-discovered-by-scientists.html
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2775823/
http://www.nature.com/articles/ncomms10815
http://wonderopolis.org/wonder/how-does-heat-both-straighten-and-curl-hair
http://www.smithsonianmag.com/science-nature/why-humidity-makes-your-hair-curl-21127724/
Images:
https://commons.wikimedia.org/wiki/File%3AHierarchical_structure_of_hair_in_the_cortex_and_cuticle.png
https://commons.wikimedia.org/wiki/File%3ACurling_iron_CISC-W2W32_by_Create_Co.%2C_Ltd._(2015-09-20).JPG