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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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Theory and application of data science

An English-taught, principle-first introduction to data science that builds data-driven thinking through exploratory analysis, visualization, modeling, and evaluation for humanities and social science students.
- XuetangX
- Self-Paced
- Free Online Course
Experiments in Biochemistry（生物化学实验）

A procedure-focused laboratory course demonstrating 17 experiments in carbohydrate, lipid, protein, nucleic-acid, and enzyme chemistry.
- XuetangX
- Self-Paced
- Free Online Course
信息组织（英文版）

Explore how organizing systems structure data, information, and knowledge through design decisions, resource management, lifecycle methods, and knowledge representation.
- XuetangX
- Self-Paced
- Free Online Course
The Organization of Information

Learn to organize data, information, and knowledge through organizing-system design, resource management, and knowledge representation.
- XuetangX
- Self-Paced
- Free Online Course
Semiconductor Physics

Connects fundamental semiconductor physics to the operation of pn junctions, MOSFETs, bipolar transistors, JFETs, and power devices.
- XuetangX
- Self-Paced
- Free Online Course
Histology and Embryology

Study microscopic tissue structure and the morphological development of human organs from fertilization through fetal formation.
- XuetangX
- Self-Paced
- Free Online Course
Thermal Physics

Develops a microscopic and macroscopic understanding of thermal physics through kinetic theory, thermodynamic laws, entropy, transport phenomena, and phase transitions.
- XuetangX
- Self-Paced
- Free Online Course
Basic Molecular Biology

Molecular biology reveals the gene structure and function, which also provides us powerful tools to explore the mystery of life science.
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- Self-Paced
- Free Online Course
Analytical Chemistry

Introduces quantitative chemical analysis through titration and instrumental methods including UV-visible, infrared, NMR, mass spectrometry, and atomic absorption.
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- Self-Paced
- Free Online Course
Heat Transfer

Develops practical methods for analyzing conduction, convection, radiation, and shell-and-tube heat exchangers.
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- Self-Paced
- Free Online Course
Electromagnetism

Builds from electric charge and fields through magnetism and induction to Maxwell’s equations and electromagnetic waves.
- XuetangX
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The Economic Way of Thinking

Interpret the world through an economic lens: rational choice, supply and demand, elasticity, taxation, regulation, market structures, price discrimination, externalities, and asymmetric information.
- XuetangX
- Self-Paced
- Free Online Course
Accountant in Business

Learn what to expect on your ACCA journey! Just start with Accountant in Business （F1）. I will support you on that path. Let us work together! YES,WE CAN!
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Brain Science and Advanced Imaging Techniques

Explorating brain science from a new insights, Advanced imaging techniques guide clinical practice.
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Pharmacology

A systems-based survey of how drugs act in the body and how major drug classes are used across nervous, cardiovascular, endocrine, and infectious diseases.
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