By focusing on peace, Glowacki provides a fresh perspective on warfare. Why did humans evolve peace? Other animals aggregate peacefully when resources are not economically defendable. The human capacity for peace may arise from two key factors: Multilevel societies and psychology shaped by within-group exchanges, which may have begun when tools enabled hominins to extract foods, including tubers and roots.

中文翻译：

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和平的根源

通过关注和平，格洛瓦茨基为战争提供了全新的视角。人类为何进化出和平？当资源在经济上无法保卫时，其他动物会和平聚集。人类的和平能力可能源于两个关键因素：多层次社会和由群体内交流形成的心理，这可能是在工具使人类能够提取食物（包括块茎和根）时就开始的。