5 days
248 neurons
Dates&Places
Dating built around places and events in your city. First you pick on the map where to go, then who to go with.
In development
415 — a mobile app studio
We make apps for Android and iOS. Right now there are three:
Brain Lifting
A practice app for school students across six subjects. Tasks adapt to each student, mistakes come back for review, and in the lab you can build an atomic nucleus or send a laser beam through glass.
Build a nucleus
Add protons and neutrons to see which nucleus you get and how long it lives. Press “Decay” to see what it turns into.
Protons
Neutrons
Tap a cell on the chart of nuclides to build that nucleus. Data: NUBASE2020, AME2020.
Refraction of light
Move the laser or the slider and change the medium. The percentages show how much light is reflected and how much gets through. From glass into air at a steep angle, the beam doesn’t get out.
n₁ sin α = n₂ sin β
Experiments in the lab
Refraction of lightA ray at the boundary of two media, total internal reflection, a prism and a lens.
Circuit builderBatteries, bulbs, resistors and meters: build a circuit and watch the current flow.
Density and buoyancyWhy some things sink and others float: blocks, liquids, a scale and a measuring tank.
Build a nucleusProtons and neutrons: which nuclei live forever, which decay, and how.
RainbowHow a water drop splits light, and why a rainbow is a circle at 42°.
How the eye sees colorSpectrum, three kinds of cones and the brain: why red and green light make yellow.
Function graphsDrag lines and parabolas with a finger and watch the formula change live.
ProbabilityGalton board, dice and coins: how chance adds up to a pattern.
Other apps
Marine Manager
Certification test prep for seafarers: the 2026 question bank, practice by topic and mistake review. Each answer shows how well it has been verified.
Testing with seafarers