From the Printz-Honor-winning author of Airborn comes an absorbing YA novel about a teen boy whose scientist parents take in a chimpanzee to be part of the family.For thirteen years, Ben Tomlin was an only child. But all that changes when his mother brings home Zan -- an eight-day-old chimpanzee. Ben&apos;s father, a renowned behavioral scientist, has uprooted the family to pursue his latest research project: a high-profile experiment to determine whether chimpanzees can acquire advanced language skills. Ben&apos;s parents tell him to treat Zan like a little brother. Ben reluctantly agrees. At least now he&apos;s not the only one his father&apos;s going to scrutinize.It isn&apos;t long before Ben is Zan&apos;s favorite, and Ben starts to see Zan as more