|aIncludes bibliographic references (p. 24) and index
|aIntroduces levers, explains how these simple machines work, and describes some common examples
|aWhat is a lever? -- How does a lever work? -- Different kinds of levers -- First-class levers at work -- Second- and third-class levers -- The earliest levers -- Levers today -- Using leverage every day -- An experiment with levers -- You can be a lever, too!