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Learners build a simple electromagnet, then use this electromagnet to transform a yogurt container into a working speaker. They can connect their speaker to a radio and listen as it transmits sound.

$1 - $5 per group Ages 11 - 14 45 to 60 minutes
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Learners create an electrical-circuit maze out of wire, then try to pass a paperclip through the maze without touching the wire.

$1 - $5 per group Ages 11 - 14 1 to 2 hours