Classroom
Study tools and exploratory utilities — drills, maps, and benches for learning in the open.
Menagerie
Spaced-repetition drills for collective animal nouns — multiple-choice for beginners or type-from-memory for a challenge. Murder of crows, pride of lions, parliament of owls, and more.
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Sonic Laboratory
A dimension for frequency exploration, tonal quizzes, auditory sandbox experimentation — and Not My Tempo, seven tempo games on public-domain classics.
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Phonetics trainer
Dictionary phonics marks (macrons, breves, schwa, sh/ch/th) or full IPA—flip cards, quizzes, and spelling tiles.
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CFA Training
Level I–III multiple-choice drills, topic filters, and right/wrong tracking in your browser.
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Historical Cities
Visualizing the "Top 10 Largest Cities" from 100 AD to 2025.
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Map of the Universe
An interactive space for exploring the Sun-centric universe map.
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