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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

…Blue is scattered almost six times more than red. Now picture the atmosphere as a thin shell around the Earth. At noon, sunlight comes down steeply…

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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.