Bill explains how we measure time and mentions some of the tools we use to measure it. He notes that time measurements, such as days, months, and years, are based on astronomical events and uses a motion machine to illustrate the Earth's revolution around the Sun and the Moon's revolution around the Earth.

A trip to the local clock shop reminds everyone in Huckle's class how important clocks are for our everyday lives.

Monster Math Squads learns how to count time and helps a monster with counting how slow does his slug go.

Bill introduces the ancestor of the modern clock: the sundial. He illustrates how it uses shadows to indicate the time of day and explains how it influenced the clock. A time lapse then shows how the sundial and clock are in sync as the hours go by during the day.

When an important package is passed on to Homer, he delivers it to Mr. Burns, the sender of the package. Mr. Burns then releases a disappointing booby trap; he is not well-versed in the metric system.