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On the first night, I saw 5 stars in the desert. On the second night, I saw 10… What do you think I saw on the third night? Combine arts and crafts, literacy, and math by making a counting book.

1 cent - $1 per student Ages 4 - 14 30 to 45 minutes
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In this activity (on pages 49-54 of PDF), learners play with tangrams, a set of triangles, squares and a parallelogram that can combine into a larger square as well as all sorts of other shapes.

1 cent - $1 per student Ages 4 - adult 45 to 60 minutes
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In this activity (on pages 16-21), learners get a sense of geological time by understanding how big a million is.

$1 - $5 per group Ages 8 - 14 1 to 2 hours
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In this activity, learners model ancient lunar impacts using water balloons.

Over $20 per group Ages 8 - 14 10 to 30 minutes