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In this activity about light and perception, learners discover how a flash of light can create a lingering image called an "afterimage" on the retina of the eye.

1 cent - $1 per student Ages 8 - 18 10 to 30 minutes
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This fun hands-on astronomy activity uses a variety of simple props to help learners understand why they see what they see in a telescope.

$1 - $5 per group Ages 4 - adult 5 to 10 minutes