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In this international citizen science activity, learners measure their night sky brightness and submit their observations into an online database.

free Ages 4 - adult 10 to 30 minutes
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In this activity, learners explore how mirrors reflect light and change the way we see things.

$1 - $5 per group Ages 11 - 14 45 to 60 minutes
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In this activity about bones (page 12 of PDF), learners investigate and compare the weight-bearing capacity of solid and hollow cylinders.

$1 - $5 per group Ages 6 - 11 1 to 2 hours