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.

Beakman explains time, how it's measured, and how clocks work. He explains the history of clocks and how we got to quartz clocks today.

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.

Lithium makes up only 0.002% of the Earth's crust, but has become a major component of technology and industry. Find out about the chemical properties of lithium, how those properties allow lithium to be versatile, and which countries are home to the world's largest supply of lithium.

Cintronella Jones catches a man making counterfeit meter sticks and arrests him because he is violating measurement standards. Later, a girl indicates that a meter is standardized across different countries in the world and even on the moon.