Unusual Traits: Tongue Rolling, Special Taste Sensors, and More (Lightning Bolt Books: What Traits Are in Your Genes?)

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!

Learn about the physical features you inherit in the What Traits Are in Your Genes? series--part of the Lightning Bolt Booksâ„¢ collection. With high-energy designs, exciting photos, and fun text, Lightning Bolt Booksâ„¢ bring nonfiction topics to life.