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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.

Using simple materials from around the house and recycled materials, learners will engineer a grabber device to pick up and put down objects that are at least 12 inches away.

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

Electrolysis is the breakdown of water into hydrogen and oxygen. This Exploratorium activity allows learners to visualize the process with an acid-based indicator.