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In this activity (on pages 41-47 of PDF), learners explore tesselating geometric patterns (repeated shapes, similar to the art of M.C. Escher).

1 cent - $1 per student Ages 4 - adult 45 to 60 minutes
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In this tabletop activity (on pages 32-40), learners make Möbius strips -- 3D surfaces with only one side.

1 cent - $1 per student Ages 4 - adult 10 to 30 minutes
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In this classic memory game (on pages 37-45 of PDF), learners turn over tiles to reveal images on the back.

1 cent - $1 per group Ages 4 - 11 45 to 60 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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Learners design different shaped bandages for different purposes. First, they draw their designs on paper.

$1 - $5 per student Ages 4 - 14 30 to 45 minutes
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Learners design, build, and test models of "dragon boats" made from up to three milk cartons.

$5 - $10 per group Ages 4 - 14 30 to 45 minutes
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In this activity, leaners explore building techniques by recreating the story of The Three Little Pigs.

$1 - $5 per group Ages 4 - 14 45 to 60 minutes
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Make a copy of the first stethoscope with only a cardboard tube! René Laennec invented the first stethoscope in 1819 using an actual paper tube!

free Ages 4 - 14 5 to 10 minutes
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In this activity (on page 2) about fingerprint analysis, learners use graphite from a pencil and scotch tape to capture their fingerprints.

$1 - $5 per group Ages 4 - 14 5 to 10 minutes
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In this activity (on pages 55-66 of PDF), learners fold paper into origami shapes and then combine several identical shapes into a three-dimensional structure.

1 cent - $1 per student Ages 4 - adult 45 to 60 minutes
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In this experiment, learners design and build a model room in a shoebox and furnish it with tiny furniture.

$1 - $5 per student Ages 4 - 14 30 to 45 minutes