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

By Buffy Silverman
Narrated by: Intuitive
Unabridged — 4 minutes
Audiobook
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By Buffy Silverman
Narrated by: Intuitive
Unabridged — 4 minutes

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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 about how your genes affect your physical features.