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Yogurt Cup Speakers
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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.

Exploring the Nanoworld with LEGO Bricks: Structures and Their Construction at the Nanoscale
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In this activity (pages 42-49), learners discover the methods and challenges of building nanoscale structures with macroscale equipment.