The tutor teaches you one compact idea. Then it stops. No multiple choice. No marks for repeating the definition. Explain what happens and why, survive the follow-up, and get a score out of 100.
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One compact idea, taught by the real tutor. Listen carefully—it will not repeat the lesson during the challenge.
You get about a minute to teach it back without hints. After that comes the awkward “why?” follow-up.
The score rewards what happens, why it happens, and the right vocabulary. A memorised definition will not carry you.