Unusual Traits: Tongue Rolling, Special Taste Sensors, and More

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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?

BN ID:	2940170049080
Publisher:	Lerner Publishing Group
Publication date:	01/01/2017
Series:	Lightning Bolt Books ® - What Traits Are in Your Genes?
Edition description:	Unabridged
Age Range:	5 - 8 Years

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