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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 a scale by comparing objects, which look similar but have different weights. Learners predict and then measure the weights of various objects using a scale.

free Ages 4 - 6 10 to 30 minutes
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In this activity, learners sniff out scents hidden in balloons! After investigating, learners discover we sometimes can use another sense (smell) to detect things too small to see.

$5 - $10 per group Ages 4 - adult 5 to 10 minutes
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In this investigation, learners plant seeds in a 2-liter bottle filled with soil that is connected to a water source below. Over the next few weeks, learners observe how the plants grow.

$1 - $5 per student Ages 4 - 14 1 to 4 weeks
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Learners make kimchee or sauerkraut, which is really just fermented cabbage, in a 2-liter plastic bottle.

$1 - $5 per group Ages 4 - 14 1 to 4 weeks
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This is an activity in which learners will find that they can detect differences in concentration better with their nose (smelling) than with their eyes (seeing).

$5 - $10 per group Ages 4 - adult 5 to 10 minutes
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Learners smell balloons filled with different scents to guess what's inside. From this, they infer the presence and motion of scented molecules.

$5 - $10 per group Ages 4 - 14 10 to 30 minutes