在医学上，青春期并不是一个模糊的概念。自20世纪中期以来，儿科和内分泌学界主要通过几类指标来判断青春期的启动时间：女孩乳房发育的起始（thelarche）、阴毛出现，以及第一次月经（初潮，menarche）。这些体征被系统地纳入性成熟评定分期体系（ Tanner ），并长期作为国际通用的临床评估工具。
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US President Donald Trump announced Friday that he was instructing every federal agency to “immediately cease” use of Anthropic’s AI tools. The move comes after Anthropic and top officials clashed for weeks over military applications of artificial intelligence.