Legal
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We want everyone to learn in their own language. Machines help us get there, and volunteers help us get it right.
Draft. This text is pending review by counsel and may change before it takes effect.
Some languages on this website may be machine-translated and may contain errors.
For legal texts, the English version prevails. This includes the Donation terms, the Privacy notice and every other page under Legal.
For lessons, consult the English original when in doubt, and use “Help improve it” on any translated page to send a correction through the contribution board.
Numbers, formulas and data are never translated: every language shows the same figures from one shared, sourced dataset.
Last updated 2026-09-28