Buffy Silverman 
Body Parts 
Double-Jointedness, Hitchhiker’s Thumb, and More

Audisee(R) e Books with Audio combine professional narration and text highlighting for an engaging read aloud experience! 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.