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Why the world gets dark so fast outside the circle of the campfire.
Make a balance that weighs very light things.
Measure the thickness of a sheet of paper.
Compare the brightness of two light sources with an oil spot on a white card.
Get Bach to the fundamentals.
Trace your shadow, then make it change.
The energy released in earthquakes ranges over many orders of magnitude.
Discover the outer limits of your eyes.
Show that gas is produced during photosynthesis.
Use straight lines to learn about circles.
Graphing can be a slippery slope to understanding.
Substitute coins for radiation.
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Attribution: Exploratorium Teacher Institute
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