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In this sorting activity, learners play a game in which they try to identify the largest number of differences between two objects.

free Ages 8 - 11 10 to 30 minutes
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In this environmental activity (page 6 of the PDF), learners identify household products that are recyclable and explore the different types of recyclable plastics.

free Ages 8 - 14 30 to 45 minutes
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In this activity about water's cohesive and adhesive properties and why water molecules are attracted to each other, learners test if objects repel or absorb water.

$5 - $10 per student Ages 8 - 11 10 to 30 minutes
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In this activity (located at the top of the page), learners make an easy river strainer and see what they can catch.

$1 - $5 per student Ages 4 - 11 1 to 2 hours
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In this activity (on page 2 of the PDF under GPS: Cactus Activity), learners will develop their own version of a tool used by biologists, a dichotomous key, by collecting all their left shoes.

free Ages 8 - 14 10 to 30 minutes
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In this interactive activity, learners analyze seashells to explore phylogeny and evolution. Learners identify similar and dissimilar seashells to create a phylogenetic tree.

free Ages 11 - 18 10 to 30 minutes
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In this math lesson, learners make wallets or purses and then participate in a variety of money-related activities. First, learners make their own paper money and paper wallets or purses.

$10 - $20 per group Ages 4 - 6 1 to 2 hours
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In this activity, learners collect, categorize, weigh and analyze classroom trash and discuss ways that engineers have helped to reduce solid waste.

$1 - $5 per group Ages 8 - 11 1 to 2 hours
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In this activity, learners play a guessing game to explore classification.

free Ages 6 - 11 5 to 10 minutes
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Learners explore their surroundings while reasoning about categories and counting.

free Ages 4 - 14 5 to 10 minutes
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In this activity, learners sort and count different colored plastic dinosaurs by various attributes including tail length, whether or not the dinosaurs have horns, etc.

free Ages 4 - 6 10 to 30 minutes
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In this activity, learners can play two card games related to endangered species, specifically North American amphibians.

1 cent - $1 Ages 6 - 11 5 to 10 minutes