Interactive explorationCells, Life & EvolutionDNA, genes and proteins
How does DNA help a cell build a protein?
Take apart a human ribosome, follow a message three letters at a time, then change a DNA base and discover what the peptide does.
Messages inside cells
Explore a molecular machine, follow a short message and connect amino-acid chains to living systems.
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Interactive exploration
Interactive explorationBody & HealthThe immune system
How does a tiny intruder set a whole response in motion?
Explore how the immune system responds to an infection. Follow immune cells from skin to lymph node, inspect an antibody structure, and discover what immune memory leaves ready.
Interactive explorationBody & HealthVaccines and immune memory
What can a vaccine leave behind after its ingredients are gone?
Open a protein-vaccine example, build a response with traceable cell lineages, and compare later encounters. Then follow the separate route from vaccine mRNA to a protein.
Interactive explorationBrain & SensesNeurons and nerve signals
How does a nerve cell send a message?
Nudge a membrane, discover when a spike appears, test its recovery, and cross a chemical synapse. Then inspect a real potassium-channel structure.
Interactive explorationCells, Life & EvolutionPhotosynthesis and plant growth
Where does a plant get the material to grow?
Open a leaf, explore a chloroplast, and supply a tiny carbon-building recipe. Discover what comes from air, what comes from water, and what light contributes.
A small distance.
A big internal pull.Explore the elbow’s leverage
Interactive explorationA big internal pull.Explore the elbow’s leverage
Body & HealthMuscles, joints and movement
Why can holding a small weight need a big muscle force?
Move a load closer to an elbow on a transparent teaching arm. See the force change, then explore how muscles can work without visible movement.
Interactive explorationBody & HealthDigestion and food
What happens to food after you swallow it?
Follow a meal through the gut, then zoom into its lining. Choose starch, protein or long-chain fat and discover why their next routes differ.
Take these steps at your own pace. Your place is not saved as account progress or scored.