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Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works
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Mixing, Circuit & Pharmacokinetic Models Sprint

A two-tank inflow concentration, an RC circuit's time constant, a compartment's outflow-only rate, a drug's half-life -- four first-order models, ninety seconds.

⏱️ 90s
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