The Boundaries of Human Knowledge
Explore the edges of what the human mind can actually perceive and understand. Learn to distinguish between what we don't know yet and what might be fundamentally unknowable.
Like Duolingo, but for The Boundaries of Human Knowledge. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
A short one: 9 levels across 2 sections, about 18 minutes end to end, roughly 4 days at five minutes a day. It moves through Mapping the Unknown and Living with Uncertainty. It starts from scratch.
Free forever · No credit card · iPhone & Android

Key ideas in The Boundaries of Human Knowledge
- New information reveals the existence of sub-topics you didn't know existed
- The 'perimeter' of your ignorance expands as your 'area' of knowledge grows
- Feeling more confused can be a sign of learning, not failure
- Temporary ignorance can be solved with more time, money, or technology
- Fundamental limits are boundaries set by the laws of nature or the structure of logic
- Recognizing a fundamental limit prevents wasting resources on an unsolvable problem
- The relationship between gaining knowledge and discovering new questions
- Distinguishing between missing data and impossible knowledge
- A 'Known Unknown' is a specific gap you are aware of
- Personal maps are filled with assumptions
- Gaining knowledge reveals new questions
- Research vs estimation
- Honesty requires distinguishing experience from hearsay
- Missing data vs impossible knowledge
- Identifying Known Unknowns manages risk
- Knowing the edge prevents wrong decisions
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives The Boundaries of Human Knowledge the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
If we imagine your knowledge as an expanding circle, what happens to the 'perimeter' where your knowledge meets the unknown?
Get it right to open this lesson and 8 more in the app.
How to learn The Boundaries of Human Knowledge, step by step
Go in order. 9 short levels across 2 sections, about 18 minutes in all, five minutes a day.
- 1
Mapping the Unknown
- The Circle of Ignorance
- The Map is Not the Territory
- 2
Living with Uncertainty
- Navigating the Fog
2 sections · 3 units · 9 levels. Built to play, not to enroll.
Questions about The Boundaries of Human Knowledge
How do I learn The Boundaries of Human Knowledge?
Go in order: start with Mapping the Unknown, then Living with Uncertainty. On Tomo that's 9 short levels, about 18 minutes in all, played five minutes a day. Start free and play the first level in under a minute.
Is there a Duolingo-style app for The Boundaries of Human Knowledge?
Yes. Tomo works like Duolingo: short daily lessons, streaks and quick quizzes. The Boundaries of Human Knowledge is one of its free courses, and you can type any other topic to get a course of your own.
Is The Boundaries of Human Knowledge free?
Yes. The Boundaries of Human Knowledge is playable on Tomo's free plan, which doesn't expire. No credit card, no waitlist. Download the app and start your first lesson.
How long does it take to learn The Boundaries of Human Knowledge?
9 levels across 2 sections, about 18 minutes of play in total. It's built for five minutes a day, so you finish it a little at a time instead of all at once.
Do I need any background to start The Boundaries of Human Knowledge?
No. It's pitched at a beginner level, so it starts where you are and builds up. If you can tap a phone, you can start.
Tomo is in ChatGPT
Tomo is also a ChatGPT plugin: the same playable courses, built and played inside your chat.
Add Tomo to ChatGPT- What to ask
- “Make me a Tomo course on black holes.” “Turn this chat into a Tomo course.”
- What you get
- Quick questions with instant feedback, hearts and stars, ready to play in about a minute.
- Where it goes
- No sign-up to start. Connect your Tomo account and your streak carries on in the app.
You pick the voice
The Boundaries of Human Knowledge is taught in the Professor style: clear, structured, thorough. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
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Start The Boundaries of Human Knowledge today.
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