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How do you measure a bubble when it's floating? You can't really, but in this activity, learners can measure the diameter of the ring of suds a bubble leaves on a flat surface.

In this activity (page 105 of the PDF), learners measure heart rate and blood pressure and learn how to obtain consistent measurements during repeated tests.

In this indoor and/or outdoor activity, learners make an anemometer (an instrument to measure wind speed) out of a protractor, a ping pong ball and a length of thread or fishing line.

Build a hydrometer (measures the density of a liquid) using a pipet or eyedropper.

In this activity, learners create a kind of balance device using a wire coat hanger, some string, and paper cups.

In this activity, learners investigate how geometry plays a role in perspective.