The impossible chessboard puzzle

2020-07-05

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Why do prime numbers make these spirals? | Dirichlet’s theorem

2019-10-08

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The unexpectedly hard windmill question (2011 IMO, Q2)

2019-08-04

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

2019-02-03

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Why do colliding blocks compute pi?

2019-01-20

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

2018-12-02

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Sneaky Topology | The Borsuk-Ulam theorem and stolen necklaces

2018-11-18

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Why slicing a cone gives an ellipse

2018-08-01

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The other way to visualize derivatives | Chapter 2, Essence of calculus

2018-05-19

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

2018-03-02

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The hardest problem on the hardest test

2017-12-08

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Thinking outside the 10-dimensional box

2017-08-11

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All possible pythagorean triples, visualized

2017-05-26

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Pi hiding in prime regularities

2017-05-19

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Euler's formula with introductory group theory

2017-03-03

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Binary, Hanoi and Sierpinski, part 1

2016-11-25

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Binary, Hanoi, and Sierpinski, part 2

2016-11-25

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Who cares about topology? (Inscribed rectangle problem)

2016-11-04

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The Brachistochrone, with Steven Strogatz

2016-04-01

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Music And Measure Theory

2015-10-03

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Euler's Formula and Graph Duality

2015-06-20

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Circle Division Solution

2015-05-23

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