character: Soundy the Sound Explorer
topic: Properties of Sound Waves
grade: 4
subject: Science
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character: Echo the Echo Enthusiast
topic: How Sounds Travel
grade: 4
subject: Science
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character: Vibrato the Vibration Expert
topic: Vibrations and Sound Production
grade: 4
subject: Science
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character: Doppler the Sound Scientist
topic: The Doppler Effect and Sound Waves
grade: 4
subject: Science
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