Brenda Walpole

Uses a question and answer format to present information about time and the seasons, such as how to split a second, who invented our calendar, and why the moon changes shapes.

Explains the elements of distance, from body measures to standard systems, furlongs and calipers, scale drawings, maps, and perspective.

Discusses different aspects of speed and describes how it is measured on land, in the water, and in the air. Includes activities that investigate the speeds of light and sound, the effect of friction, and more.

Discusses the elements of time and various ways to measure it, from shadow clocks and digital watches to calendars and time zones.