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Are balloons porous or non-porous? In this activity, learners watch an entertaining Mr. O video and conduct a simple experiment to find out.

In this outdoor activity, learners use only their senses to to find the extremes of several environmental variables or physical factors: wind, temperature, light, slope and moisture.

In this math activity, learners estimate how many pennies are in a jar by predicting and counting handfuls of pennies.

In this activity, learners build a simple pinhole viewer. They use this apparatus to project images from a variety of light sources, including a candle, the Sun, and the Moon.

Historically, sea floor mapping (bathymetry) was done by soundings.

In this activity (on pages 16-21), learners get a sense of geological time by understanding how big a million is.

This is an activity (located on page 4 of the PDF under What's Nano? Activity) about size and scale.