Dimples! They're so cute, but surprisingly mysterious! What causes them naturally and how can we make them happen?

Hosted by: Hank Green
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Sources:
https://www.google.com/patents/US2091276
https://link.springer.com/article/10.1007/BF02449856
http://onlinelibrary.wiley.com/doi/10.1002/ajmg.1320360337/full
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2238342/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3385407/
https://www.ncbi.nlm.nih.gov/pubmed/9810983
https://www.ncbi.nlm.nih.gov/pubmed/9725574
https://www.ncbi.nlm.nih.gov/pubmed/24317251
https://www.ncbi.nlm.nih.gov/pubmed/7958797
http://udel.edu/~mcdonald/mythdimples.html
http://omim.org/entry/126100

Images:
https://commons.wikimedia.org/wiki/File:Buccinator_muscle_lateral.png
https://commons.wikimedia.org/wiki/File:Sobo_1909_260_-_Zygomaticus_major_muscle.png
https://en.wikipedia.org/wiki/Joseph_Gordon-Levitt#/media/File:Joseph_Gordon-Levitt_Mar_2009.jpg
https://commons.wikimedia.org/wiki/File:AdamLevine2011.jpg