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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Images:
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...