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Short teaching videos made with AI tools. A person checks each one before it's published, including its labels, so you can search by concept rather than guessing the title.

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2:02

Why the Sky Is Blue and Sunsets Are Red

Everyday science · Intro

Claude Opus 5.5

99 1

atmospherecolorlight

…itself. Sunlight looks white, but it's a mix of wavelengths, from violet near four hundred nanometers, through blue, green and yellow, to red near seven…

How search finds things

Labels, checked by a reviewerEvery video carries a subject, a level and a few concept labels from one shared list. A reviewer fixes them before publishing.

Other names for the same idea“grad descent”, “gd” and “gradient descent” reach the same videos. Reviewers add these when they merge two labels.

What's said in the videoSearch also reads the transcript, so a concept mentioned in passing still turns up, with the line that mentions it.