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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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批判性思维——方法和实践


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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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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


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人际沟通


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生物医学工程导论


生物医学工程将工程学方法应用到生物和医学领域，帮助人类更好的认识生物体活动并帮助病患得到更好的照料。本课程将以实例的形式介绍生物医学工程的内容。
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动态测试与分析（下）

工作机械会发出各种动态信号，本门课程讲授动态信号内积变换原理，从原理上教会你如何分析动态信号，进而通过分析结果了解工作机械的内部状态。
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系统学习实验室化学品危险识别、风险控制、应急处理与安全管理。
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绿色创新理论与实践2

从环境社会学、公共政策、公益诉讼与未来城市等多学科视角理解绿色创新及其环境治理实践。
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清华大学实验室安全课程—生命伦理基础


Explore fundamental bioethics principles, covering genetic modification, animal testing ethics, and cloning technology while developing critical ethical thinking for research and daily applications.
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工作机械会发出各种动态信号，本门课程讲授动态信号内积变换原理，从原理上教会你如何分析动态信号，进而通过分析结果了解工作机械的内部状态。
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新型城镇化战略与城乡治理


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