Have you ever wondered how seesaws go up and down or how screws stay secure in walls?In the How Do series, readers are invited to guess and then explore the science behind the right answers. Beginning concepts of mechanical engineering, including levers, wedges, inclined planes, and more, are explored in this newest engaging addition to the How Do seriesAbout the How Do series: These visually appealing STEM titles for inquisitive readers and young science enthusiasts, are fully illustrated nonfiction picture books that are a great introduction to various STEM topics. Each title includes facts and figures, simple diagrams and hilarious illustrations and is written in a question-and-answer format to encourage readers to ask questions and guess the answers before exploring the science behind the correct answers.