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Earlier subject records do not have a shared recency order. Choose your learning area; your saved work is unchanged.
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Exploring
Follow a question. Discover an idea. Explore AI, mathematics and science through small experiments.
Explore an experimentBrowse subjectsStart anywhere. No account or coding required.
What makes you curious?
Mathematics
Find patterns. Turn a rule into a graph.
ExploreScience
Ask a question and test it with evidence.
ExploreArtificial Intelligence
Build a small model. See how it learns.
ExploreEnglish Language Arts
Explore stories, shape ideas, and revise.
ExploreSocial Studies
Investigate people, places, and decisions.
ExploreAll subjects
Follow your curiosity into something new.
ExploreCan a smaller step teach us more?
Change the learning rate, take one step, and compare the result. This is a working model—not a picture of one.
Explore the full lessonCan a bigger step make learning worse?
Predict first: will the loss go down? Then take a step.
Live CPU model · loss = (2 × weight − 4)². Axes adjust with the proposed step. This preview does not change saved lesson work.
What changes when you change the rule?
Try an input, compare the outputs, and see a function take shape.