Description
提供的文本资料全面概述了打制石器的发明及其对人类进化的深远影响。这些资料首先修正了石器技术的起源时间，指出肯尼亚发现了可追溯至330 万年前的石器，远早于传统的奥尔德万（Oldowan）文化起始点（约 260 万年前）。该文本详细阐述了石器技术在适应气候变化、促进食物获取（尤其是肉类和骨髓处理）、增强狩猎与防御能力等方面所发挥的关键作用。此外，资料也探讨了石器发明如何推动了技术文化（奥尔德万和阿舍利文化）、社会组织（劳动分工和阶层萌芽）、认知能力和身体结构（如人脑容量增加和手部结构适应）等多个维度的进化。
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