character: Dolphin Danny
topic: Sound Waves in Water
grade: 4
subject: Science
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character: Professor Wave
topic: Properties of Sound in Different Mediums
grade: 4
subject: Science
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character: Captain Echo
topic: How Sound Travels Underwater
grade: 4
subject: Science
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character: Nina the Narwhal
topic: Communication in Marine Animals
grade: 4
subject: Science
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