Science needs diagrams, not stock clips
A good science explanation is mostly pictures: the parts of a cell, light splitting in a prism, a curve going up. Stock-footage tools fill science videos with lab coats and glowing blue particles that explain nothing. ContentRoof draws the actual idea, sentence by sentence.
The science toolkit
- Hand-made animated illustrations for the topics that come up most: a black hole, DNA, an atom, a galaxy, a prism, a brain, a heart, a fractal snowflake that builds itself level by level, and more.
- Line drawings for everything else, matched by meaning from about 10,000 open-source drawings, tracing on as each word is spoken.
- A powers-of-ten zoom when the script talks about scale: "a cell is a thousand times smaller than…" nests one thing inside the other and pulls the camera back.
- Counters that count up to big numbers like "86 billion neurons".
- Rising and falling charts when a sentence describes growth or decline.
- Steps joined by arrows for processes, and cycles for loops like the water cycle.
- Two-sided layouts for comparisons: "Mercury is closer to the Sun, but Venus is hotter."
An example script
# hook
Your brain has more connections than there are stars in the Milky Way.
# stat: 86 billion | label: neurons in the human brain
Inside your skull are about 86 billion neurons.
# headline: Signals in a hurry
Each neuron passes signals to thousands of others, then those cells pass them on again.
The stat: scene gets a count-up with a ring. The words "then" and "pass them on" mark a process, so the last scene can become a flow of drawings joined by arrows.
Which visual fits which idea
| The idea | What appears |
|---|---|
| "How big / how small" | Powers-of-ten zoom |
| "It doubled every year" | A rising chart |
| "Water evaporates, condenses, then falls as rain" | A flow or cycle of drawings |
| "86 billion neurons" | A counter |
| "Light is made of every colour" | The hand-made prism |
| "A star collapses into a black hole" | The hand-made black hole |
What makes a science Short work
- Start with something surprising that the rest of the video explains.
- One step per sentence. Each sentence is a picture, so a chain of short sentences reads like an animated diagram.
- Compare to things people know. "As wide as a human hair" gives the zoom something to show.
- Say the numbers. Spoken numbers become counters and charts.
- Check the facts. The AI's draft is a starting point. Read it before you publish.
Who it's for
Science and space channels, teachers making a short explainer for class, students revising, and museums or tutors who want short videos without filming. It works in all 10 languages, including Urdu and Hindi, where the drawing model matches words in their own script.
How it works
- Ask a science questionType a topic or a question. The AI writes a hook, one idea per scene and an ending.
- Highlight the key wordsPut stars around the word each scene is about, add a stat line for a big number, or name the drawings with draw:.
- Preview the diagramsWatch diagrams trace themselves, counters count up and zooms pull back. Change any scene's drawing if you want.
- DownloadSign in with Google for free and download a vertical Short, a 16:9 video for class or YouTube, or a square post.
Questions
Which science topics have hand-made illustrations?
There are 26, including a black hole, DNA, an atom, a galaxy, a prism, a brain, a heart and a fractal snowflake. Other topics are illustrated with line drawings matched by meaning.
Can it show scale, like atoms or galaxies?
Yes. When the narration compares sizes, a powers-of-ten zoom nests the smaller thing inside the bigger one and pulls back as each is named.
Will it get the science right?
The AI writes a careful draft, but you should check it. Every line of the script is editable before you download.
Can teachers use it for lessons?
Yes. The Lesson + quiz mode teaches one idea step by step and ends with a quiz and its answer.
Is there a watermark?
No. Downloaded videos have no watermark.
Updated 2026-10-28