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In this activity, learners conduct a simulation exercise related to public key encryption and try to intercept a message sent between two learners.

free Ages 11 - 18 30 to 45 minutes
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In this activity (on pages 18-29) learners explore the impact of the March 24, 1989 oil spill in Alaska caused by the Exxon Valdez tanker.

$5 - $10 per group Ages 8 - 14 1 to 2 hours
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In this activity, learners help a poor cartographer color in the countries on a map, making sure each country is colored a different color than any of its neighbors.

1 cent - $1 per group Ages 6 - 18 30 to 45 minutes
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In this activity, learners explore how the shapes, sizes, and distances of land masses appear differently on two different models of Earth: an icosahedron and a flat map.

1 cent - $1 per group Ages 11 - 18 30 to 45 minutes
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In this activity, learners use a fictitious map of "Tourist Town" and counters to problem solve how to place ice-cream vans on street intersections so that every other intersection is connected to one

$1 - $5 per group Ages 11 - 18 45 to 60 minutes