character: Echo
topic: Understanding Sound Waves
grade: 6
subject: Science
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character: Waves Willy
topic: Properties of Sound Waves
grade: 6
subject: Science
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character: Soundwave Sally
topic: How Sound Travels in Different Mediums
grade: 6
subject: Science
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character: Frequency Fred
topic: The Relationship Between Frequency and Pitch
grade: 6
subject: Science
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