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Learn by correcting AI.

Lumi the robot solved a problem, but one step is wrong. Can you find it?

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Lumi the robot detective inspecting clues at a desk
One line is lying 🔍
Ages 9–11

How it works

Step 1 of 4

Find the wrong step

Lumi the robot answers a question and shows its thinking. One step is wrong. Read from the top and tap the first step that goes wrong.

Which seedling grows more green leaves: the one under a lamp, or the one in the dark?

1Soil and water are the same for both seedlings, so they cannot cause a difference.

2Light is the only thing that differs between the two seedlings.

3Plants make more food in the dark, because darkness lets them rest.

4The seedling kept in the dark will grow more green leaves.

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Where the AI comes in

Lumi’s mysteries are written by AI and checked by AI, so there is always a fresh one, and every one is right.

  1. 1

    AI writes every mystery

    A new story, new numbers, the same classic mistake. Come back to a lesson and the AI writes you a different version, so practice is never memorising answers.

  2. 2

    A second AI checks it

    Before a child sees it, a second AI solves the question on its own, and code redoes every sum. They must agree on one right answer and one true explanation.

  3. 3

    Nothing unchecked gets through

    A draft that fails is rewritten. After three failures it is thrown away. A wrong lesson is worse than none, so none reaches a child.

Create a lesson from your mistakes

Your progress

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