过去几周，特朗普政府不断升级的贸易战让全球市场陷入混乱。美股暴跌、美元走弱、美债收益率飙升——这些反常现象背后，是一个更危险的信号：美国已不再被视为安全的国家（the US is no longer seen as safe）。

Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient ...