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Young readers who wonder how the world works can find answers to questions like why we yawn, what snot is made of, and what the sound barrier is. Each entry takes up one puzzle and explains it in a clear, kid-friendly way.

The questions span several branches of science, including chemistry, physics, biology and geology. Quirky cartoon illustrations accompany the answers, helping the explanations stick. The 80-page book is aimed at children aged seven and up, and its science content was reviewed by a science expert.

The book works well for reading aloud at home or in class and is suited to elementary school students. It is nonfiction.