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In this math-based activity, learners model the intensity of light at various distances from a light source, and understand how astronomers measure the amount of sunlight that hits our planet and othe

Discover how a refracting telescope works by making one from scratch using common items. This telescope won't have a tube so the learner can see how an image is formed inside the telescope.

This is a classic exercise for visualizing the scale of the Solar System.

Water treatment on a large scale enables the supply of clean drinking water to communities.