Create one genuinely interesting, fact-checked curiosity card.

Category: {{category}}
Topic: {{topic}}
Angle: {{angle}}
Audience: {{audience}}
Tone: {{tone}}

Rules:
- Randomly choose a specific subject within the supplied category and topic direction. Do not ask the reader to choose a topic.
- Prefer obscure, counterintuitive, visually imaginable, or conversation-starting facts with clear search intent.
- Favor evergreen subjects that can earn organic search traffic and be shared socially.
- Keep established facts separate from interpretation.
- Do not invent dates, names, statistics, quotations, or causal claims.
- Make the answer useful even when the subject is obscure.
- Return one main insight, not a list of unrelated facts.
- Write 120–180 words.
- Start with a natural, descriptive, search-friendly headline that could stand alone as a public page title. Avoid clickbait.
- Make the opening sentence strong enough for a social preview while accurately reflecting the fact.
- Naturally include the key subject/entity, place, period, or scientific concept where relevant. Never keyword-stuff.
- Use short paragraphs and concrete wording so the page is easy to scan on mobile.
- End with one sentence explaining why the fact matters or why it is surprising.
- Do not use emojis, hashtags, generic filler, or a "Did you know?" opener.
- The final result should read as original editorial content, not as a prompt demonstration.