From Emily Calandrelli—host of Xploration Outer Space, correspondent on Bill Nye Saves the World, and graduate of MIT—comes the first novel in a brand-new chapter book series about an eight-year-old girl with a knack for science, math, and solving mysteries with technology. Ada Lace—third-grade scientist and inventor extraordinaire—has discovered something awful: her neighbor’s beloved Yorkie has been dognapped! With the assistance of a quirky neighbor named Nina (who is convinced an alien took the doggie) and her ever-growing collection of gadgets, Ada sets out to find the wrongdoer. As their investigation becomes more and more mysterious, Ada and Nina grow closer, proving that opposites do, in fact, attract.

Inspired by mathematician Ada Lovelace 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

This new edition is designed to accompany the multimedia planetarium show. Includes a new preface and a revised set of Big Kid Boxes.

From Emily Calandrelli—host of Xploration Outer Space, correspondent on Bill Nye Saves the World, and graduate of MIT—comes the third novel in a fun illustrated chapter book series about an eight-year-old girl with a knack for science, math, and solving mysteries with technology. Third grader and inventor extraordinaire Ada Lace likes nothing more than to tinker with mechanics like her robot, George. Her latest project is to fix up a ham radio, something that she could use to contact people on this planet…and beyond. The only problem is that she just can’t get it to work properly. During a sleepover, Ada’s best friend Nina hears something strange coming from the radio in the middle of the night. A distant voice says, “Release the swarm!” convincing Nina that aliens are about to invade planet Earth. Could Ada and Nina have stumbled upon something…extraterrestrial?

From Emily Calandrelli—Emmy-nominated host of Xploration Outer Space, host of Netflix’s Emily’s Wonder Lab, and graduate of MIT—comes the sixth novel in a fun illustrated chapter book series about an eight-year-old girl with a knack for science, math, and solving mysteries with technology. When third grader and inventor extraordinaire Ada Lace learns her teachers are in dire need of new school supplies, she’s eager to lend a helping hand—but how? With a bake sale? A class carnival? Most ideas seem out of reach for a kid like her, until Tycho suggests Ada try her hand at posting informational videos. If she’s able to build up a big online viewership, she could easily raise funds for their school. And with Nina as her visionary director, Milton as her comedic cohost, and Ada as the scientist star, making fun videos will be a piece of cake! Or so they think. What starts as an earnest try at making fun, science-based shorts ends up being a whole mess for Ada and the gang as they gain popularity and take on peer pressure, trolls, and tests of their friendships. With her rising internet stardom, will Ada be able to stay true to herself?

From Emily Calandrelli—Emmy-nominated host of Xploration Outer Space, correspondent on Bill Nye Saves the World, and graduate of MIT—comes the fifth novel in a fun illustrated chapter book series about an eight-year-old girl with a knack for science, math, and solving mysteries with technology. Third grader and inventor extraordinaire Ada Lace is on spring break. But it’s just a little less relaxing than she’d imagined. Nina is beside herself with excitement about meeting her favorite artist and enlists Ada and Mr. Peebles’s coding-whiz nephew to help revamp her online portfolio. When Nina finally meets Miroir, he snubs her, and her confidence is shaken—but not enough to miss the art show opening. While there, Ada spots a suspiciously familiar painting that may mean Miroir isn’t the original he claims to be. Will the friends be able to reveal the artist’s true nature, before he fools someone else?

From Emily Calandrelli—Emmy-nominated host of Xploration Outer Space, correspondent on Bill Nye Saves the World, and graduate of MIT—comes the fourth novel in a fun illustrated chapter book series about an eight-year-old girl with a knack for science, math, and solving mysteries with technology. Third grader and inventor extraordinaire Ada Lace has a new social studies teacher—who loves group projects. While most of the class has constructed regular dioramas with clay and construction paper, Ada, her best friend Nina, and sometimes nemesis Milton have built a complex scale model of an historic silver mine. But when Milton reveals that he added his “old Milton touch” on their project right before turning it in, Ada worries that he has sabotaged their work. In a desperate attempt to save their project, Ada and Nina use their combined creative and technical prowess to perform a heist and break into their teacher’s supply closet after school. Do the two friends have what it takes to deceive the school’s security system? Or will they get caught trying to pull off this seemingly impossible mission.