How Do People Develop a Stutter?

Kings, scientists, and musicians alike have all been known to stutter. It can make speaking in front of crowds even more nerve-wracking, but is anxiety the root cause? Spoiler: probably not.

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Sources:
http://mentalfloss.com/article/19503/8-famous-stutterers
http://www.telegraph.co.uk/culture/film/8223897/The-Kings-Speech-the-real-story.html
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http://www.webmd.com/children/news/20100210/genetic-mutations-linked-to-stuttering#1
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Images:
https://commons.wikimedia.org/wiki/File:GodfreyKneller-IsaacNewton-1689.jpg
https://commons.wikimedia.org/wiki/File:King_George_VI_of_England,_formal_photo_portrait,_circa_1940-1946.jpg
https://commons.wikimedia.org/wiki/File:Human_brain_frontal_(coronal)_section.JPG
https://commons.wikimedia.org/wiki/File:Human_brain_midsagittal_cut.JPG