Kirill Sidorov
Rocks
4.4
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Venomous animals
4.6
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Theory of music
4.6
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Musical instruments
4.2
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The prophets of the Old Testam
4.7
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Muscular system
4.8
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Neurophysiology
4.6
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Helicopters
4.5
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Telecommunications equipment
4.2
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Aerospace engineering
4.6
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