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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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AI Engineering
Data Analysis
Cybersecurity
Arab-Islamic History: From Tribes to Empires
ODS en la Agenda 2030 de las Naciones Unidas: Retos de los Objetivos de Desarrollo Sostenible
Understanding Dementia
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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.
A mathematical treatment of probability that moves from random variables and limit theorems to estimation and hypothesis testing.
Explore the lives, discoveries, and scientific values of 21 Nobel Prize-winning chemists while tracing a century of chemistry’s development.
Builds practical foundations in identifying organic compound structures by combining MS, NMR, IR, Raman, UV-vis, XPS, and X-ray diffraction.
Introduces core management functions through global organizations, covering culture, diversity, ethics, decision-making, planning, communication, human resources, and innovation.
Foundational thermal engineering course linking thermodynamic cycles, refrigeration, heat transfer, and heat exchangers for engineering practice.
An introduction to TCM’s philosophical foundations and core theories of organs, Qi, blood, body fluids, disease causes, pathogenesis, prevention, and treatment.
A problem-driven discrete mathematics course organized around knowledge structures and experiments connecting logic, sets, algebra, and graph theory.
Builds microwave transmission-line and network foundations, then applies electromagnetic theory to antenna radiation, efficiency, polarization, and array design.
Explore interdisciplinary science topics from nanomaterials to AI, covering chemistry, biology, food safety, and environmental protection with real-world applications.
学习动态规划、变分法和庞特里亚金极小值原理,设计并仿真实际系统的最优控制器。
Explore when markets produce efficient outcomes, why they fail, and how government policies can address externalities, public goods, and monopolies.
Analyze when markets allocate resources efficiently and when they fail: supply and demand, elasticity, externalities and public goods, consumer choice, production costs, and market structures from competition to oligopoly.
Learn how money moves between countries: trade currencies with forwards, swaps and options, read balance-of-payments accounts, and analyze exchange-rate systems and IS-LM-BP policy.
Learn classic investment theory and apply it: efficient market hypothesis, Markowitz portfolios, CAPM and multifactor models, bond duration and convexity, plus performance evaluation in Excel.
Apply ratio, trend and DuPont analysis to income statements, balance sheets and cash flow statements, comparing IFRS, US and China accounting standards to assess company performance.
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