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In this activity, learners build a tool called an inclinometer that can find the height of any distant object, from a tree to the North Star.

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

In this activity, learners hook up a hair to a lever system and create a hair hygrometer to measure changes in humidity.

In this activity, learners discover that our hands are not reliable thermometers.

In this activity, learners make a scale model of the Solar System and learn the real definition of "space." Learners use the online calculator to create an appropriate scale to use as a basis for thei