From the author of the bestselling This Little series comes the second board book about the science behind everyday thingsthis one about big vehicles at the construction site!Join the construction crew and learn how big vehicles work and about the inventors behind them through simple rhyming text and vibrant illustrations. From bulldozers to excavators to concrete mixers and beyond, this engaging board book connects the dots between people and the technology they create and gives age-appropriate explanations of scientific concepts like homogenous mixtures and power hydraulics!