Nine live lessons to try. In each one the learner moves a figure, makes a call or answers a check, and the lesson says why.
A lesson shows them all. Drag an input and the figure, the numbers and the result change together.
A lesson gives the learner something to do: a figure to move, a case to decide, a check to answer.
A lesson does. Every option has a reason under it, so a wrong answer teaches as much as a right one.
A point cloud of GB electricity demand against temperature, a fitted curve, and the moment more bends stop helping. Real NESO and Met Office data.
Open the lessonFinancial examsPrice against yield with the duration tangent. Drag coupon, maturity and yield and watch the gap that convexity explains.
Open the lessonAccountancy and taxBands that fill as a salary slider moves, the personal allowance taper, and the computation laid out the way the exam wants it. 2025/26 rates.
Open the lessonHealthSusceptible, infected, recovered. R0 and recovery sliders, the herd immunity threshold, and a real 2020 curve beside the model.
Open the lessonHealthPlasma concentration over time against a therapeutic window. Dose, interval and half-life sliders, a loading dose, a missed dose, and a drug calculation.
Open the lessonAviationTemperature, pressure altitude and weight against the runway you have. Pass or fail, live, with the exam calculation.
Open the lessonEconomicsSupply, demand and a per-unit tax. Elasticity sliders move the wedge, the shares and the deadweight loss.
Open the lessonLawA scenario builder that draws the timeline of communications and names the case that decides whether a contract formed. No chart, all branching.
Open the lessonInvestment managementWeights, correlation and volatility on sliders. The risk-return curve, the minimum-variance point and the capital allocation line.
Open the lessonLooking for your field? The use cases are one page for each kind of educator, with the lessons closest to your field.