Castalia Institute

Every lecture.
Ask anything.

All of Khan Academy and MIT OpenCourseWare — delivered by our AI Faculty, completely interruptible so you can ask questions or request explanations at any moment.

Start Learning How It Works

The Problem

The world's best educational content already exists — Khan Academy covers K-12 and beyond, MIT OpenCourseWare offers university-level courses from one of the world's best institutions. But video lectures are passive. You can't raise your hand. You can't say "wait, I don't understand that step." You just hit rewind and hope.

Our Approach

Singh delivers every lecture through an AI Faculty member who teaches the material conversationally. At any point, you can interrupt — ask a question, request a different explanation, go deeper, or skip ahead. The lecture adapts to you, not the other way around.

How It Works

Choose a Lecture

Browse thousands of lectures from Khan Academy and MIT OCW, covering math, science, humanities, computer science, and more.

Your AI Faculty Teaches

An AI Faculty member delivers the lecture content segment by segment in a live conversation — not a wall of text, but a real teaching dialogue.

Interrupt Anytime

Ask "why?", request an example, challenge an assumption, or say "explain that differently." The faculty member responds, then picks up right where they left off.

What's Available

We're making the complete libraries of two of the world's most important open education resources available through dialogic delivery.

Khan Academy

Free world-class education for anyone, anywhere

✓ Math: Arithmetic through Linear Algebra & Differential Equations
✓ Science: Biology, Chemistry, Physics, Organic Chemistry
✓ Computing: AP CS, Algorithms, Cryptography
✓ Humanities: World History, US History, Art History, Economics
✓ Test Prep: SAT, LSAT, MCAT, AP Exams

MIT OpenCourseWare

University-level courses from MIT, free and open

✓ Mathematics: Calculus, Linear Algebra, Probability & Statistics
✓ Computer Science: Algorithms, AI/ML, Systems, Theory
✓ Physics: Classical Mechanics, Quantum, Electromagnetism
✓ Engineering: Electrical, Mechanical, Chemical, Biological
✓ Humanities & Social Sciences: Economics, Philosophy, Linguistics

What is Dialogic Delivery?

Traditional lectures are monologues. You listen, or you don't. Dialogic delivery transforms every lecture into a conversation. The AI Faculty member presents the material in segments, pausing naturally — and at any point, you can jump in.

a.euler: Let's explore why e^(i*pi) + 1 = 0. This connects five fundamental constants...

you: Wait — why is e special? I never really understood that.

a.euler: Great question. e is the unique number where the rate of growth equals the current value. Imagine a bank account that compounds continuously...

you: Ok, that makes sense. Keep going.

a.euler: Right. So with that understanding of e, now consider what happens when we raise it to an imaginary power...

Every lecture. Ask anything.