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Chasing 100M Daily Users, Duolingo Reconsiders Ads, Paying Influencers, and Its Most Expensive Plan

AI got cheap enough that Duolingo’s most expensive plan may not survive it. I read the earnings call transcript and opened the app to see what is actually changing for learners.

Dhawal Shah Sep 03, 2026

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中国哲学新视野


“中国哲学新视野”主要讲授诸子时代儒家、墨家、道家和法家的思想主张和政治伦理意义，内容涉及到孔子、墨子、老子、庄子、孟子、荀子和韩非子等思想家的理论主张。
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马克思与当代欧陆思想


以马克思主义在当代欧陆思想中的接受与发展为线索，梳理20世纪西方思想家与社会文化思潮。
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逻辑学基础理论


系统讲解一阶逻辑的完全性、不完全性与不可判定性定理，并结合模型论和希尔伯特计划探讨其数学与哲学意义。
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逻辑、计算和博弈


Introduction to the themes of information, computation, agency, and games in logic.
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自然辩证法概论


以马克思主义自然观为线索，探讨科学技术方法、社会运行与中国科技创新观。
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中国古代小说鉴赏与研究


探索中国古典小说的艺术魅力，通过细致赏析《三国演义》、《水浒传》、《西游记》等经典名著，深入理解中国传统文化精髓和社会变迁。
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合成生物学：科学与伦理


从合成生物学、转基因与基因编辑的争议出发，探讨生命伦理、自然观与科技自由。
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逻辑学前沿报告——向量空间、信念基础的逻辑


聚焦向量空间模型、信念基础、混合逻辑与博弈逻辑等前沿主题的逻辑学报告系列。
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清华李宁教授：AI原生组织的成长逻辑


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电磁暂态分析


课程讲授电磁暂态数值计算的基本方法，及其在电力系统、电气系统电磁暂态分析中的应用。
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清华陈劲：人工智能时代的创新创业


探讨人工智能时代如何以更低成本、更快速地解决复杂问题，提升创新能力并激发创业潜能。
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城市人工智能理论与方法


探索生成式人工智能在城市研究、空间重构与规划设计中的UrbanAI应用。
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气体与气瓶安全基础


系统学习气瓶事故、气体风险、压力容器及附件安全，以及实验室气瓶采购、搬运、储存和使用要求。
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Sustainable resource recovery from used water

Explores how wastewater can be reclaimed while recovering carbon, nutrients, and energy through sustainable technologies, integrated systems, and economic evaluation.
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学在清华·真人图书馆66期(清华教职工特场第三场)

学在清华·真人图书馆66期(清华教职工特场第三场)
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