BrainStuff Classics: Why Is Head Scratching a Gesture of Thought?

Some gesticulations come naturally -- scratching your head when you're thinking is so common that it's basically a cliche. But why? Learn what researchers have to say in this classic episode of BrainStuff, based on this article: https://people.howstuffworks.com/why-do-scratch-heads-when-were-thinking.htm

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