Explore math and the natural world.
Unfold a solid. Follow a ray of light. Watch a breath. Start with a question, change a condition, and use evidence to explain what you discover.
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19 courses
Cube nets
Which two faces never meet when you fold a cube?
Unfold, refold and try a different net. Follow six colored faces to discover adjacent and opposite pairs.
Unfold a cubeCuboids & surface area
How much paper does it take to wrap a box?
Change the length, width and height. Lay out all six faces to see where the surface area formula comes from.
Unwrap a boxVolume & unit cubes
How many little cubes, without counting each one?
Build one layer, then stack more. Connect counting unit cubes to the formula for volume.
Build volume layer by layerCross sections of a cube
Can slicing a cube make a hexagon?
Move a cutting plane and compare the solid with its flat cross section. Watch how the shape changes.
Explore a sliceWater changing state and cycling
How can water leave a liquid surface and later become droplets again?
Use particle motion and energy transfer to connect evaporation, condensation, precipitation, and collection.
Open lessonDiffusion and particle motion
Why can a smell or colour spread even when nobody stirs it?
Track how particles spread from a concentrated region toward a more even distribution, distinguishing diffusion from stirring and reaction.
Open lessonBreathing and circulation
How does inhaled oxygen reach body cells, and how does carbon dioxide leave?
Follow air, alveoli, and blood to explain how ventilation, gas exchange, and circulation work together.
Open lessonRefraction of light
Why can light change direction when it enters another medium?
Use an interface, normal, angles, and refractive index to predict how light bends, then explore total internal reflection.
Open lessonMagnetic field around a current
How does the field around a wire change when its current changes?
Change the direction and magnitude of current in a straight wire, using a compass to test the surrounding field’s direction and relative strength.
Open lessonEquivalent fractions: one whole, different partitions
Why do 3/4 and 6/8 name the same number?
Align fraction bars, split every part equally, and see why multiplying numerator and denominator by the same whole number preserves the shaded length.
Open lessonPythagoras: squares on three sides
Why does the sum of the squares on the legs equal the square on the hypotenuse?
Change the two legs of a right triangle and compare the areas of squares on all three sides to verify a²+b²=c².
Open lessonLevers and torque balance
How can a smaller force balance a larger force?
Change force and perpendicular distance from the pivot, then use torque to predict which side wins.
Open lessonSeries, parallel, and a switch
Why does source current change when the same two resistors are connected differently?
Compare voltage, current, and equivalent resistance for two ideal resistors in series, parallel, and an open circuit.
Open lessonConserving atoms in chemical equations
When water forms, how can both sides of the arrow contain exactly the same numbers of H and O atoms?
Adjust only coefficients, count each element before and after a reaction, and reduce a balance to its lowest whole-number ratio.
Open lessonPhotosynthesis and limiting factors
If increasing one input no longer raises the rate, which other factor may be limiting the process?
Use a normalized qualitative model to compare relative availability of light, carbon dioxide, and water and identify the limiting input.
Open lessonLinear functions and rate of change
How does a line's change per step appear in its equation, table, and graph?
Adjust slope and intercept while the graph, coordinates, and value table update together; see what each parameter controls in y = mx + b.
Open lessonBuoyancy, density, and floating
Why does floating depend mainly on a density ratio rather than weight alone?
Change liquid density, object density, and volume; compare weight with buoyant force and observe displacement when the object floats, is neutrally buoyant, or sinks.
Open lessonSolution mass fraction and dilution
Why does a solution become less concentrated when only water is added?
Change the masses of solute, water, and added water, then use conserved solute mass to explain dilution.
Open lessonEnergy transfer through a food chain
Why is less energy usually available to the next trophic level higher in a food chain?
Adjust producer energy and transfer efficiencies between trophic levels to track how energy decreases step by step.
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Predict. Test. Explain.
Every course pairs hands-on exploration with readable explanations. Explore on your own, work with a parent, project it in class, or take the questions to paper.