When we started, the obvious way to organise learning content was by school subject: Maths, Science, English, Arabic, History. We tried it. It didn't work.

What broke about subject organisation

Kids don't think in subjects. They think in curiosities. "Why is the sky blue?" isn't physics; it's physics + optics + atmospheric science + some philosophy. Forcing it into "Physics" buries the other entry points.

The five alternatives we tried

1. Subjects. Too rigid.
2. Ages. Too flat — kids at the same age have wildly different interests.
3. Themes (space, animals, art). Better — but still arbitrary edges.
4. Questions. Works in a textbook, doesn't scale.
5. One giant pool of content with tags. Works algorithmically, fails for navigation.

What 73 worlds + 8 galaxies does

The galaxies (Sciences, Technology & Making, Humanities & Society, Language & Communication, Arts & Performance, Life & Wellness, Personal Growth, Outdoors & Play) are coarse enough that any parent can navigate them. The 73 worlds are fine-grained enough that a kid feels like they're in a specific place — "Astronomy world", "Magic Tricks world" — not a category.

And 73 is roughly the biggest number where a grid still feels manageable on a phone. At 100+, kids can't scan it.

Pick an age band and start filling Xplorer's tank