小树的博物馆有一处古老火塘。火早就存在，人类改变了什么？Mia finds an ancient hearth in a museum. Fire already existed in nature. What did people change?
第 1 步：从遇见到照料Step 1: From finding to tending
先区分野火与受控用火。First separate wild fire from controlled use.
闪电能引起野火。人类学会保存和照料火种。火塘把热量集中在固定地点。发现烧焦物，并不等于发现火塘。Lightning can start a wildfire. People learned to preserve and tend fire. A hearth concentrated heat in one place. A burnt object alone does not prove that people controlled the fire.
第 2 步：热量改变食物Step 2: Heat changes food
照料火种，生活会怎样改变？How could tending fire change daily life?
加热会改变食物结构。有些食物因此更容易消化。火也提供温暖和光。它同时带来烟雾与灼伤风险。Heat changes the structure of food. Some foods then become easier to digest. Fire also provides warmth and light. It brings smoke and burn hazards as well.
第 3 步：证据需要拼起来Step 3: Assembling the evidence
怎样知道古人真的在用火？How do we know people used a fire?
研究者比较灰烬、烧石与位置。多次使用的痕迹更有说服力。最早用火的时间仍有争论。一个日期不能代表所有地区。Researchers compare ash, heated stones, and their locations. Repeated use provides stronger evidence. The earliest timing remains debated. One date cannot describe every region.
🎮 机制实验室：观察，再判断🎮 Mechanism lab: observe, then decide
拖动查看证据组合。支持变强不代表能推出精确年代。Compare evidence combinations. Stronger support does not give an exact date.
一句话记住它：Remember it:受控用火，把自然热源变成可照料的工具。Controlled fire turned a natural heat source into something people could tend.
闪电能引起野火。Lightning can start a wildfire.加热会改变食物结构。Heat changes the structure of food.研究者比较灰烬、烧石与位置。Researchers compare ash, heated stones, and their locations.
机制：较高把握。最早年代：有争议。展柜故事为教学重构。High confidence in the mechanisms. Earliest dates are debated. The museum story is a teaching reconstruction.
核对日期：2026 年 10 月 6 日。文字与配图由 AI 生成；已做来源核对及程序测试，待人工复核。Checked 6 October 2026. Text and illustrations are AI-generated. Sources and software checks were performed; human review is pending.
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