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In this activity, learners conduct an experiment to test how fast they can react. Learners try to catch a piece of paper with a ruler printed on it (or a ruler) as quickly as they can.

free Ages 6 - 11 5 to 10 minutes
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In this activity, learners control the (apparent) size of a hole with their brain.

1 cent - $1 per student Ages 11 - 18 5 to 10 minutes