i = 0x5f3759df - ( i >> 1 );
The math under the hood of code, games, and everyday ideas.
Animated explainers of clever tricks like Quake III's fast inverse square root, and the fundamentals that make them click. New videos on YouTube.
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Fast Inverse Square Root: How Quake III's Magic Number Works. Watch on YouTube
What we make
Clever tricks
The surprising math inside famous code and algorithms, unpacked step by step.
Fundamentals
The essential ideas explained clearly, building intuition before formulas.
How it's made
Every video is animated with Manim, the open-source library behind 3Blue1Brown, and narrated with an AI voice.