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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.

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XuetangX

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XuetangX is an open online learning platform for Chinese students. It offers massive courses in multiple disciplines, with a mission to build an affordable, quality learning environment for everyone.

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Principles of Electric Circuits

Electricity is everywhere. Learn about real world applications of electric circuits and the techniques for analyzing and designing circuits.
- XuetangX
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- Free Online Course
Water and Wastewater Treatment Engineering: Biochemical Technology

The main professional course of environmental engineering, environmental science, municipal engineering and other related majors.
- XuetangX
- Self-Paced
- Free Online Course
History of Chinese Architecture Part II

This course explores China's rich and varied architectural history. (In Mandarin with English subtitles.)
- XuetangX
- Self-Paced
- Free Online Course
Water and Wastewater Treatment Engineering: Physicochemical Technology

Introduce basic principle, process, operation characteristics, process calculation method of the main physiochemical (waste)water treatment methods.
- XuetangX
- Self-Paced
- Free Online Course
China’s Perspective on Climate Change

Understand China's position, actions and future plans on climate change and its impacts.
- XuetangX
- Self-Paced
- Free Online Course
教育定量研究方法（高级）

Advanced causal inference methods for evaluating educational research designs, from instrumental variables and randomized experiments to regression discontinuity and matching.
- XuetangX
- Self-Paced
- Free Online Course
International Non-degree Students Orientation for SPRING 2023

Discover essential information, guidelines, and campus services for international non-degree students at Tsinghua University through this comprehensive online orientation session.
- XuetangX
- Self-Paced
- Free Online Course
The first univerity-wide lecture via Rain Classroom

The first university-wide lecture delivered via Rain Classroom.
- XuetangX
- Self-Paced
- Free Online Course
New course mode in e-era

Learn what online education is, explore the development trends of online education, and find ways to solve problems existing in online education.
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Finite Element Method (FEM) Analysis and Applications

The main content of this course includes: fundamental mathematics and mechanics method, basic properties of the finite element method
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Fundamentals of Automotive Crash Safety

Fundamental knowledge and theory and the state-of-the-art technologies of vehicle crash safety and human body impact protection.
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Contemporary Electronic System Design

Learn contemporary electronic system design across sensors, mixed-signal circuits, FPGA, and SoC through experiments and design methods.
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Geology and Engineering Geology

The course will introduce the basic geology knowledge and engineering geological analysis principles and methods to better use and protect the earth!
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Signals and Systems

Signals and Systems: This course will help you to understand fundamental concepts, principles, analysis and designs of signals transmitting through systems.
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Computational Geometry

In this introductory computer science course, explore geometry, develop geometric thinking, and learn geometric algorithms.
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