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Body Parts: Double-Jointedness, Hitchhiker's Thumb, and More

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Can you stretch your thumb back to your arm? Is your pinkie straight or slightly bent? What determines the way your joints bend-or don't bend? 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 Books™ collection. With high-energy designs, exciting photos, and fun text, Lightning Bolt Books™ bring nonfiction topics to life!

What Traits Are In Your Genes? Body Parts: Double-Jointedness, Hitchhiker's T...