elace and physicist Marie Curie, this #1 bestseller from author Andrea Beaty and illustrator David Roberts champions STEM, girl power, and women scientists in a rollicking celebration of curiosity, the power of perseverance, and the importance of asking "Why?"

Now a Netflix series!
#1 New York Times Bestseller
A Wall Street Journal Bestseller
A USA Today Bestseller

Ada Twist's head is full of questions. Like her classmates Iggy and Rosie (stars of their own New York Times bestselling picture books Iggy Peck, Architect and Rosie Revere, Engineer), Ada has always been endlessly curious. Even when her fact-finding missions and elaborate scientific experiments don't go as planned, Ada learns the value of thinking through problems and continuing to stay curious.

Ada is an inquisitive second grader who was born to be a scientist. She possesses an unusual desire to question everything she encounters: a tick-tocking clock, a pointy-stemmed rose, the hairs in her dad's nose, and so much more. Ada's parents and her teacher, Miss Greer, have their hands full as the Ada's science experiments wreak day-to-day havoc.

On the first day of spring, Ada notices an unpleasant odor. She sets out to discover what might have caused it. Ada uses the scientific method in developing hypotheses in her smelly pursuit. The little girl demonstrates trial and error, while appreciating her family's full support. In one experiment, she douses fragrances on her cat and attempts to place the frightened feline in the washing machine.

For any parent who wants STEM (Science, Technology, Engineering, and Math) to be fun, this book is a source of inspiration that will get children excited about science, school, learning, and the value of asking "Why?"

Check out all the books in the Questioneers Series:

• The Questioneers Picture Book Series: Iggy Peck, Architect Rosie Revere, Engineer Ada Twist, Scientist Sofia Valdez, Future Prez Aaron Slater, Illustrator Lila Greer, Teacher of the Year
• The Questioneers Chapter Book Series: Rosie Revere and the Raucous Riveters Ada Twist and the Perilous Pants Iggy Peck and the Mysterious Mansion Sofia Valdez and the Vanishing Vote Ada Twist and the Disappearing Dogs Aaron Slater and the Sneaky Snake
• Questioneers: The Why Files Series: Exploring Flight! All About Plants! The Science of Baking Bug Bonanza! Rockin' Robots!
• Questioneers: Ada Twist, Scientist Series: Ghost Busted Show Me the Bunny Ada Twist, Scientist: Brainstorm Book 5-Minute Ada Twist, Scientist Stories
• The Questioneers Big Project Book Series: Iggy Peck's Big Project Book for Amazing Architects Rosie Revere's Big Project Book for Bold Engineers Ada Twist's Big Project Book for Stellar Scientists Sofia Valdez's Big Project Book for Awesome Activists Aaron Slater's Big Project Book for Astonishing Artists