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Make snack time into measuring time and learn to read Nutrition Facts labels. Try this when you’re using “pourable” foods, such as cereal, yoghurt, or juice.

In this activity, learners explore the relative size of the Sun and Earth as well as the distance between them.

In this activity, learners play a card game that explores different size scales--macro, micro and nano.

In this activity, learners investigate just how small a billionth of a meter is by attempting to cut a paper ruler down to a nanometer-sized sliver.

In this activity, learners mark their height on a height chart and discover how tall they are in nanometers.

This is a quick activity (on page 2 of the PDF under Gecko Feet Activity) about the forces of gravity and surface tension and how their behavior is influenced by size.

In this activity, learners calculate the width (horizontal diameter) of the blind spot on their retina. Learners make a blind spot tester using a piece of notebook paper.

In this activity, learners examine raindrop bottles (prepared ahead of time) to observe in slow motion the behavior of falling droplets and explore concepts such as drag and terminal velocity.

In this demonstration, learners attempt to get a large coin through a small hole, the size of a smaller coin.

This activity puts a mathematical twist on the familiar “guessing jar.” No guesses allowed, estimates only.