How Big Is Everything?

A tour of sizes in steps of ten, from a hair to the moon, with an experiment in every lesson.

• 01Why we measure9 min
• 02Steps of ten11 min
• 03Things you cannot see12 min
• 04Things you can hold10 min
• 05Things you can walk around13 min
• 06Things you can only walk to12 min
• 07The size of the Earth14 min
• 08The moon and the sun15 min
• 09How sure are you?10 min
• 10Making your own chart12 min