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Practice vocabulary, visualize algorithms, explore concepts — learn by doing, right in your browser.
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Chengyu Guess
A daily four-character Chinese idiom guessing game with a multi-layer hint system. Six tries to crack the hidden idiom.
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Scale Sense
Translate any big number into real-world equivalents — 245 hand-picked anchors from every continent, from the speed of light to a bubble-tea cup, so abstract magnitudes finally feel like something.
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Sundial Simulator
An interactive sundial for understanding solar geometry — adjust latitude and date to watch shadows move.
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