Not a whole chapter at once, but one key concept at a time: open with a real case, unpack the core ideas, see how scientists found out, then confirm you've got it at a checkpoint — answer correctly to unlock the next step. 不是一次餵完整章，而是一次一個關鍵概念：真實案例引入 → 拆解核心觀念 → 看科學家如何發現 → 檢查點確認，答對才解鎖。