"Find out about the fantastic machines that are used to cut stones from a quarry, tarmac a road, drill a giant tunnel, and build a towering skyscraper.".
When Wanda's little brother accidently port-a-shrinks Ms. Frizzle and the kids, they end up trapped in a bathroom with no way out! But using the materials at hand, and some very constructive ideas, they're soon building hair-roller towers and Band-Aid bridges.