Learning world
Earth World
Source-backed discoveries about deserts, cultural wonders, and the many ways trains move.
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6 discoveries
Deserts of the World
Six source-backed discoveries about five major Earth deserts and the cold desert of Mars.
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World Wonders
Five source-backed discoveries about extraordinary cultural heritage sites around the world.
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Types of Trains
Five source-backed discoveries about steam, diesel-electric, electric, high-speed, and maglev trains.
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