PreS-Gr 3— Libby and her classmates are excited when their science teacher, Mr. Darwin, announces a new student will be joining them the next day. The students quickly make a plan to welcome the newcomer with an ice cream party. Mr. Darwin starts the next day by teaching the young learners about the states of matter, laying the foundation for an unplanned hands-on experience. The story takes an unexpected turn when Libby forgets to put the ice cream in the freezer, thus transforming a solid into a liquid. Mr. Darwin turns this mishap into a valuable learning opportunity and suggests using hot chocolate as a replacement. The substitution of the hot chocolate becomes a catalyst for exploring the states of matter through a delightful experience involving ice, melting marshmallows, and a selection of delicious toppings. He cleverly incorporates scientific concepts, allowing the children to explore solids, liquids, and gases in a fun and interactive way. Digitally created illustrations depict a diverse classroom that makes a visually appealing backdrop for Libby's love of learning. The book's familiar setting, likable characters, and humorous statements and situations combine well with the age-appropriate science. The inclusion of back matter featuring a glossary and recipes enhances the book's educational value and makes it a valuable resource for STEM lessons. VERDICT A recommended resource for educators and a delightful read for young science enthusiasts. Ideal for science units, this book successfully combines informative content with fun.— Lynne Stover