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In this simple exploratory activity (1st activity on the page), blindfolded learners try to identify mystery items by smell.

In this activity, learners examine baking powder, a combination of three powders: baking soda, cream of tartar, and cornstarch.

This is a classic exercise for visualizing the scale of the Solar System.

In this activity (on pages 13-16 of the PDF) learners investigate three mystery samples to see which one contains life. The three samples are sand, sand and yeast, and sand and antacid.