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Unusual Traits: Tongue Rolling, Special Taste Sensors, and More (Lightning Bolt Books: What Traits Are in Your Genes? (Paperblack))
Unusual Traits Tongue Rolling Special Taste Sensors and More - Lightning Bolt Books: What Traits Are in Your Genes? Paperblack Author:Buffy Silverman 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? Read this book to find out!