Grades K-2. The team behind Iggy Peck, Architect (2007) and Rosie Revere, Engineer (2013) introduce a new STEM picture-book heroine. Ada Marie Twist is an African American girl who does not speak until the age of three. But once she does, she starts with “Why? And then What? How? and When? / By bedtime she came back to Why? once again.” Ada Twist’s curiosity is insatiable, often involving more chaos than method. A particularly bad smell sets Ada off on a journey of discovery that puts her at odds with her parents, though eagle-eyed readers will discover the source of the stink. The pen-and-ink illustrations incorporate a mishmash of white space and the paraphernalia of scientific experimentation: blocks, beakers, graph paper, gadgets; at times the pages can barely contain the breadth of Ada’s inquisitiveness. An author’s note reveals that the heroine is named after trailblazing women scientists Marie Curie and Ada Lovelace. Young Ada Twist and her nonstop intellect might just encourage readers to blaze trails of their own.