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VISUAL SYSTEMS

Visual mental models for the systems you use but don't fully understand. No prerequisites. No hand-waving. Just clear, animated explanations.

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Latest Videos

How Databases Search a Billion Rows

How Databases Search a Billion Rows

Every database you use is built on B-trees. See how they minimize disk I/O to search billions of rows efficiently.

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How Coding Agents Actually Work

How Coding Agents Actually Work

How do tools like Claude Code, Cursor, and Devin actually write code? The ReAct loop, tool calling, and context management — animated.

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How DNS Actually Works

How DNS Actually Works

Every step of a DNS query visualized — from your browser's cache to root servers and back, in under 7 minutes.

Docker Isn't a VM. Here's What It Actually Is.

Docker Isn't a VM. Here's What It Actually Is.

Docker containers are not virtual machines. See how namespaces, cgroups, and union filesystems create isolated Linux processes.

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How JavaScript's Event Loop Actually Works

How JavaScript's Event Loop Actually Works

How JavaScript runs 1000 async tasks on a single thread. The call stack, task queue, microtask queue, and Web APIs — visualized.

Your Branch Is 41 Bytes (Git Internals Explained)

Your Branch Is 41 Bytes (Git Internals Explained)

Git is a content-addressable object store, not a diff tracker. See how blobs, trees, and commits actually work under the hood.

gitgit internalshow git works
What Actually Happens Inside a Hash Map

What Actually Happens Inside a Hash Map

A deep dive into hash maps — from the core hash-to-index trick, through collisions and resizing, to how Python, Java, and Go implement them differently.

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The Secret Compiler Inside Python

The Secret Compiler Inside Python

Python compiles to bytecode before interpreting it. See the hidden compiler, the dis module, and what actually runs when you hit Enter.

You Don't Hate Recursion. You Were Taught It Wrong.

You Don't Hate Recursion. You Were Taught It Wrong.

Recursion visualized from the ground up. Watch the call stack build, see Fibonacci branch into a tree, and understand why memoization changes everything.

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How Transformers See Every Word at Once

How Transformers See Every Word at Once

Self-attention, query-key-value, feed-forward networks, and generation — the full transformer architecture, animated step by step.