From the acclaimed author of Hurricane Season, an unforgettable story about what makes a family, for fans of Hazel's Theory of Evolution and Ivy Aberdeen's Letter to the World.Eleven-year-old Joey is angry. All the time. And she doesn't understand why. She has two loving moms, a supportive older half brother, and, as a triplet, she's never without company. Her life is good. But sometimes she loses her temper and lashes out, like the time she threw a soccer ball-hard-at a boy in gym class and bruised his collarbone. Or when jealousy made her push her (former) best friend (and crush), Layla, a little bit too roughly.After a meltdown at Joey's apartment building leads to her family's eviction, Joey is desperate to figure out why she's so mad. A new unit in science class makes her wonder if the reason is genetics. Does she lose control because of something she inherited from the donor her mothers chose?The Science of Being Angry is a heartwarming story about what makes a family and what makes us who we are.