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Buffy Silverman, Paperback
Unusual Traits: Tongue Rolling, Special Taste Sensors, and More (Lightning Bolt Books ® ― What Traits Are in Your Genes?)
Unusual Traits: Tongue Rolling, Special Taste Sensors, and More (Lightning Bolt Books ® ― What Traits Are in Your Genes?)
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Can you roll your tongue into a U-shape? Some people can. But other people's tongues stay flat. What determines whether you can roll your tongue?
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