How colliding blocks act like a beam of light...to compute pi.

The most unexpected answer to a counting puzzle

But why is a sphere's surface area four times its shadow?

Using topology for discrete problems | The Borsuk-Ulam theorem and stolen necklaces

Why 5/3 is a fundamental constant for turbulence

Quaternions and 3d rotation, explained interactively

Visualizing quaternions (4d numbers) with stereographic projection

Q&A with Grant Sanderson (3blue1brown)

Why slicing a cone gives an ellipse (beautiful proof)

Other math channels you'd enjoy

Divergence and curl: The language of Maxwell's equations, fluid flow, and more

The other way to visualize derivatives | Chapter 12, Essence of calculus

The Wallis product for pi, proved geometrically

Winding numbers and domain coloring

How pi was almost 6.283185...

Why is pi here? And why is it squared? A geometric answer to the Basel problem

The more general uncertainty principle, regarding Fourier transforms

But what is the Fourier Transform? A visual introduction.

Why this puzzle is impossible

Q&A #2 + Net Neutrality Nuance

The hardest problem on the hardest test

Backpropagation calculus | DL4

Backpropagation, step-by-step | DL3

Gradient descent, how neural networks learn | DL2

But what is a neural network? | Deep learning chapter 1

Some light quantum mechanics (with minutephysics)

Thinking outside the 10-dimensional box

Hilbert's Curve: Is infinite math useful?

How secure is 256 bit security?

But how does bitcoin actually work?

All possible pythagorean triples, visualized

Pi hiding in prime regularities

Taylor series | Chapter 11, Essence of calculus

Higher order derivatives | Chapter 10, Essence of calculus

What does area have to do with slope? | Chapter 9, Essence of calculus

Integration and the fundamental theorem of calculus | Chapter 8, Essence of calculus

Limits, L'Hôpital's rule, and epsilon delta definitions | Chapter 7, Essence of calculus

Implicit differentiation, what's going on here? | Chapter 6, Essence of calculus

What's so special about Euler's number e? | Chapter 5, Essence of calculus

Visualizing the chain rule and product rule | Chapter 4, Essence of calculus

Derivative formulas through geometry | Chapter 3, Essence of calculus

The paradox of the derivative | Chapter 2, Essence of calculus

The essence of calculus

Euler's formula with introductory group theory

Fractals are typically not self-similar

Tattoos on Math

But what is the Riemann zeta function? Visualizing analytic continuation

Binary, Hanoi, and Sierpinski, part 2

Binary, Hanoi and Sierpinski, part 1

3blue1brown channel trailer

Who cares about topology? (Old version)

Abstract vector spaces | Chapter 16, Essence of linear algebra

Eigenvectors and eigenvalues | Chapter 14, Essence of linear algebra

Change of basis | Chapter 13, Essence of linear algebra

Cross products | Chapter 10, Essence of linear algebra

Cross products in the light of linear transformations | Chapter 11, Essence of linear algebra

Dot products and duality | Chapter 9, Essence of linear algebra

Nonsquare matrices as transformations between dimensions | Chapter 8, Essence of linear algebra

Inverse matrices, column space and null space | Chapter 7, Essence of linear algebra

The determinant | Chapter 6, Essence of linear algebra