Collection
Gene regulation, PCR, protein biosynthesis, cell division, evolution, metabolism and ecology to try out.
Apps
A population as a swarm, its alleles as colours. 20 populations run in parallel as a fan of lines: without evolutionary factors p stays constant, while drift, bottleneck, founder effect, selection, migration and mutation shift it. Work out the carrier share from the disease frequency step by step.
Biology (Gymnasium)Try it
A bacterial cell in 3D with the lac and trp operons: drag lactose, glucose and tryptophan into the cell, repressor and CAP dock, the polymerase runs or stops and the enzyme level is plotted over time. Truth table, logic circuit and mutants as prediction tasks.
Biology (Gymnasium)Try it
An invented forensic case: choose primers, run the first three cycles by hand, start the programme, load the gel and read the bands against the marker under blue light. The strands count themselves: 2ⁿ − 2n target fragments, 2n long strands. Zooming into a band reveals billions of molecules of equal length.
Biology (Gymnasium)Try it
An RNA polymerase reads a gene in 3D: the bubble travels along and the mRNA grows 5′→3′ on the template strand. For eukaryotes with cap, poly-A, splicing (lariat, alternative splicing) and export through the nuclear pore; enter your own DNA sequence.
Biology (Gymnasium)Try it
A ribosome reads the mRNA codon by codon: charged tRNAs act as adapters and deliver their amino acid to the A site, the rRNA forms the peptide bond, until a stop codon releases the protein. Change bases or the reading frame and watch the protein change live, up to a polysome.
Biology (Gymnasium)Try it
Tap a base in the real β-globin gene and watch the mRNA and amino acid chain rearrange: silent, missense, nonsense or frameshift. Plus the sickle cell, chromosome and genome mutations, and UV damage with repair.
Biology (Gymnasium)Try it
One diploid cell becomes four different gametes: follow in 3D how meiosis I separates homologous chromosomes and meiosis II sister chromatids. With crossing over, a shuffle for random assortment, n/2n and DNA counters, and nondisjunction leading to trisomy 21.
Biology (Gymnasium)Try it
A 3D cell divides: interphase to cytokinesis on a scrubbable timeline, with counters for chromosomes, chromatids and DNA content. It shows why both daughter cells receive the same chromosome set.
Biology (Gymnasium)Try it
Cut a target gene and plasmid with restriction enzymes, join them with ligase, and explore bacterial replication and protein production.
Biology (Gymnasium)Try it
Cas9 with its guide RNA slides along a DNA double helix, checks every PAM site (NGG), unwinds the DNA and forms the R-loop. Only with full pairing do HNH and RuvC cut both strands 3 bp before the PAM. Then choose the repair: end joining (NHEJ) with an insertion or deletion, or precise copying from a template (HDR). A mismatch in the seed prevents the cut. Exhibit-ready.
Biology & neuroscienceTry it
Genetic pedigrees of different inheritance patterns (autosomal/gonosomal, dominant/recessive, e.g. red-green color blindness); determine the inheritance pattern, read off genotypes and carriers.
Biology (Gymnasium)Try it
A population with two variants (light/dark peppered moth); selection pressure and background (industrial melanism) shift the frequencies over generations. Variation + selection → adaptation.
Biology (Gymnasium)Try it
A geographic barrier splits a population; over generations the groups drift apart until they can no longer interbreed (allopatric speciation).
Biology (Gymnasium)Try it
Explore how a matching substrate binds to an enzyme, splits and releases products while the enzyme remains unchanged. Compare an incompatible substrate.
ChemistryTry it
Follow light reactions and the Calvin cycle through six stages. Discover that released oxygen comes from water, and adjust light intensity to change the pace.
Biology (Gymnasium)Try it
Protons flow through the membrane and turn a ring of c subunits; the γ stalk deforms the three β subunits in turn (open, loose, tight), and every turn makes three ATP. Change the gradient and the c-ring (c8, c10, c14), read the energy balance per ATP, run it backwards as a proton pump. Exhibit-ready.
Biology & neuroscienceTry it
Explore the fluid-mosaic bilayer and selective permeability: small lipid-soluble molecules pass freely, ions require open channels and larger molecules are blocked.
Biology (Gymnasium)Try it
Adjust Lotka–Volterra parameters and compare time series with phase space. Follow predator peaks lagging behind prey peaks in the model’s cycles.
Biology (Gymnasium)Try itCollections
See through Latin sentences and understand participles, in real passages from Seneca and Ovid.
5 appsOpen collection
Galvanic cells, reaction mechanisms, equilibrium, acids and bases, kinetics and molecular structure to try out.
13 appsOpen collection
Photoelectric effect, potential well, double slit, atomic model, fields, induction and oscillations to try out.
16 appsOpen collection
Planning and steering projects: the iron triangle, stakeholders, network diagrams, earned value, schedule risk, team size, Kanban and waterfall against Scrum.
8 appsOpen collection
From sequences to loans: arithmetic and geometric growth, savings plans, annuities, compounding within the year and perpetuities.
11 appsOpen collection
Reading the traces: burial mounds in section, radiocarbon dating, settlements in the landscape and the tomb of Tutankhamun.
5 appsOpen collection
Why robot arms are heavy, how six axes guide a hand and how control holds the load.
4 appsOpen collection
Tables, keys, joins, groups and subqueries you can touch: how a database really reads.
7 appsOpen collection
Generative AI in strong images: what it can do, how it writes, why it convinces, how to use it well and where to take care.
7 appsOpen collection
Engine, brakes, high voltage, CAN bus and chassis: technology and diagnostics of the modern vehicle.
9 appsOpen collection
Heat in the city centre: heat islands, shade, trees and unsealing, using the old town of Reutlingen as an example.
5 appsOpen collection
Reading the small print, spotting subscription traps, placing risk figures and making texts understandable.
4 appsOpen collection
From equation to curve: initial values, linear equations, substitution and the worlds in which they apply.
7 appsOpen collection
Mean, median, mode, box plot and levels of measurement: descriptive statistics to try out.
9 appsOpen collection
From coordinates to the inverse: vectors, dot and cross products, linear equations and matrices in pictures.
12 appsOpen collection
Production principles, waste, one-piece flow, value streams, bills of materials and routing: how a factory is organised.
9 appsOpen collection
What the CRA requires of manufacturers: checking whether it applies, meeting reporting deadlines, keeping software bills of materials.
5 appsOpen collection
Reducing, common denominators, multiplying, dividing and mixed numbers: fractions step by step.
7 appsOpen collection
Proofs of special beauty to touch: Zagier's windmills, the museum guards and Buffon's needle.
3 appsOpen collection
How oscillations break down: coefficients, symmetry, phasor chains, the Gibbs phenomenon and the plucked string.
7 appsOpen collection
What happens inside the machine: objects, methods, operators, slicing and sorting in Python, visible step by step.
9 appsOpen collection
From the Patent Motor Car to the Z3: famous machines and experiments cut open in 3D.
11 appsOpen collection
Keyboard, intervals, scales, chords, the circle of fifths and groove: music theory you hear and play.
9 appsOpen collection
How sound is made and shaped: synthesizers and samplers, envelopes and overtones, waveforms and timbre, voice and orchestra, room acoustics and sound scenography — all audible in your browser.
16 appsOpen collection
Staging space, sight, light, sound and paths: visitor flows, showcase lighting, room acoustics, sound islands, projection mapping and the pavilions of world expos to try out.
15 appsOpen collection
Mathematical questions open for decades, for which an AI model proposed solutions in 2026, as interactive apps: understand the problem, experience the result.
32 appsOpen collection
From neurons and gradients to transformers, RLHF and agents: machine learning you can touch.
44 appsOpen collection
DNA, replication, transcription, translation and cell division as explorable 3D models.
26 appsOpen collection
Perspective, ornament, structure and space: how art and architecture work with mathematics.
21 appsOpen collection
Hyperloop, autonomous vehicles, warehouses and conveyors: logistics as interactive simulation.
17 appsOpen collection
Heart, eye, voice, skeleton and nerves: the human body in 3D, layer by layer.
10 appsOpen collection
Monty Hall, Simpson, Berkson and base rates: where intuition fails us with numbers.
14 appsOpen collection
Planets, stars, black holes and space probes: the cosmos to explore.
10 appsOpen collection
Light switches for nerve cells, a telescope made of ice, mirror-image chemistry and interest rates: the 2026 Nobel Prizes to try out.
8 appsOpen collection
Planted participants, smoke in the room, one dollar for a lie and experimenters who are themselves the subjects: famous social psychology experiments to try yourself.
5 appsOpen collection
Relations, classes, orders, bijections, different infinities and topology: mathematics as the science of structure, hands-on.
11 appsOpen collection
Riemann, P vs NP, Poincaré and other great questions of mathematics, made tangible.
16 appsOpen collection
Counting, arithmetic and shapes: maths for beginners, playful and clear.
6 appsOpen collectionWant to use these apps in your courses? Let’s find out what works for you.
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