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Beginner
Level 1 · Ages 5–7
Sprout
Short, friendly passages with simple words.
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Easy
Level 2 · Ages 8–10
Explorer
Everyday stories that build vocabulary.
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Intermediate
Level 3 · Ages 11–13
Voyager
Richer narratives and inferential questions.
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Advanced
Level 4 · Ages 14–16
Scholar
Essays, articles, and longer-form reading.
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Expert
Level 5 · Adult
Sage
Complex texts with critical reasoning.
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History18technology11science9innovation8economics7invention7finance6nature6engineering5Mythology5Technology History5biology4entrepreneurship4folklore4Friendship4health4physics4sports4AI3animals3business3space3astronomy2biography2consumer electronics2culture2electric vehicles2family2football2Genetics2heroes2imagination2kindness2manufacturing2Medicine2money2personal finance2robotics2space exploration2stories2weather23D printing1achievement1adventure1Afterlife1algorithms1ancient civilizations1Ancient Egypt1ancient Greece1ancient history1animation1audio technology1automotive industry1automotive safety1basketball1battery technology1bedtime1biochemistry1biomedical technology1Biotechnology1birds1black holes1blockchain1body1brand history1Brazil1British Empire1budgeting1business history1business strategy1cautionary tale1children's story1city park1civilization1climate1commerce1community1Consequences1controversy1corporate strategy1courage1creativity1credit score1cricket1CRISPR1cryptocurrency1Curiosity1daily objects1deception1diagnostics1digital finance1drones1e-commerce1Earth science1electricity1emergency preparedness1emotions1energy1energy storage1ethics1fantasy1feelings1fiber optics1financial literacy1first aid1Formula 11Future1future technology1geography1global communication1global trade1globalization1gods1Government Policy1graphic design1Greek Mythology1Hope1hygiene1immune system1India1inflation1infrastructure1internet1internet infrastructure1Japanese culture1justice system1knowledge1law1leadership1Letter1life cycle1light1logistics1magic1Mars1medical imaging1medical science1military strategy1miniaturization1motorsports1MRI1mystery1navigation1Norse mythology1ocean1Personal Computing1photovoltaic1plants1problem-solving1product development1reading1Religion1renewable energy1renewal1rocket science1rules1safety1school1scientific innovation1seasons1small business1social impact1solar energy1sound engineering1Space Colony1space elevator1sports history1startups1story1strength1submarine cables1supply chain1teamwork1technology innovation1teenagers1tennis1textiles1toys1trade1trickster tales1US History1Walt Disney1water cycle1West Africa1zero gravity1