character: Sally
topic: The Science of Density and Buoyancy
grade: 4
subject: Science
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character: Buoyant Bob
topic: Understanding Why Objects Float
grade: 4
subject: Science
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character: Diving Dave
topic: Exploration of Ocean Currents and Density
grade: 4
subject: Science
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character: Floating Fiona
topic: Investigating Materials That Float
grade: 4
subject: Science
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