ExplainerTools

Science · Interactive demo

Why is a rainbow always a circle?

Move the Sun and see why drops on a 42-degree cone form a circle around the shadow of your head.

Created by ExplainerTools.

What you’ll explore

This interactive demo gives you a visual way into science. The key ideas include rainbows, optics, refraction, weather.

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Explore interactive ideas in space, science, math, and more. Try a demo, read an interactive article, watch a short video, and follow what makes you curious.

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The three newest models, each with a short film. Watch the question, then play with the answer.

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A collection for the curious.

ExplainerTools collects interactive explainers, visual essays, and educational videos that help an idea make sense. Browse by subject, follow a topic, or find a creator whose way of explaining speaks to you.

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Every entry credits its original creator. Supported experiences play here, with a link to the creator’s original work available in the player. Inclusion does not imply a partnership or endorsement.

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Views, likes, and bookmarks count activity on ExplainerTools. They don’t include views or likes from a creator’s website or social accounts. Newest means most recently added to this collection. Ties are ordered by date added, then our curated catalog order.

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