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Genetic difference. Just like people who can raise one eyebrow. Not all of us have the same muscle control. Likely a leftover from days where we could point our ears towards a sound like small-eared dogs can.
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Wait until y'all hear about ear rumbling and eye wiggling...
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Anybody can learn to use these muscles. It doesn't just come naturally.
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Some people say maybe. Some say maybe not.
https://www.livescience.com/33809-wiggle-ears.html
https://www.nytimes.com/2017/01/16/science/wiggle-ears.html
“Some people can reportedly improve their ear wiggling by concentration and practice, but they have to have the ability to begin with.”
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The things that it requires most is patience.
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Just like people who can raise one eyebrow.
https://en.wikipedia.org/wiki/Tongue_rolling
Tongue rolling is the ability to roll the lateral edges of the tongue upwards into a tube. The tongue's intrinsic muscles allow some people to form their tongues into specific shapes. Rolling the tongue into a tube shape is often described as a dominant trait with simple Mendelian inheritance, and it is commonly referenced in introductory and genetic biology courses, although there is some disagreement.[1]
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