Deeply Hidden ThingsOne price, one family, everything in it.
No tiers, no per-child charge, no add-ons. The first Big Idea is free and always will be.
The whole Gravity & Relativity module — three complete lessons, both renderings.
- No account needed
- No card
- Nothing expires
- Progress saved in your browser
Everything, for every child in the house.
- All twelve Big Ideas as they’re released
- Parent guides, printable
- Unlimited learner profiles
- Quarterly synthesis projects
- Cancel any time — progress kept
Checkout is not live yet. The curriculum is being built first.
Two months free, and it matches the way the curriculum is built — thirty-six weeks.
- Everything in monthly
- Works out at $6.58 a month
Checkout is not live yet.
Free where the price is the barrier
A supplement priced for a US household is out of reach in much of the world, and the point of this project is not to teach relativity only to children who were going to get it anyway. Full free access will be available on request in lower-income countries. If the price is the thing stopping you, write to us and we’ll open it.
What happens if you stop paying
You go back to the free module. Your children’s profiles and everything they’ve done are kept, not deleted. A lapsed subscription is not a request to erase a year of your family’s work, and if you come back in September it will all still be here. Deleting is a separate thing you have to ask for on purpose — and when you do, it’s real.