Turn an old CD into a spectroscope to analyze light.
Make a conductivity meter and let your electrolytes shine.
Build an electroscope to detect electrical charge using straws.
Construct a simple hydrometer to compare the densities of solutions.
Dark-colored materials absorb and emit energy more readily than light-colored materials.
Make a record player with a pencil, pin, and paper.
Measure the height of an object indirectly using your hand and a ratio.
Find the height of a tree, paper rocket or North Star.
Break water into hydrogen and oxygen with a simple device.
Build a simple wind generator.
Make a balance that weighs very light things.
Measure the thickness of a sheet of paper.
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