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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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Free online courses and certificates from Harvard, Stanford, MIT, University of Pennsylvania and other top universities in United States. Learn Multivariable Calculus, Kanji, Manufacturing Processes and other popular topics.
Herb Gross's 1971 video series revisits calculus of several variables, from vector and matrix arithmetic through partial derivatives, multiple integrals, line integrals and Green's theorem.
Video lectures on the kanji of Tobira lessons 1–5, teaching how to write each character alongside the stories behind its form.
Five video lectures on the kanji from Tobira lessons 6–10, teaching stroke-by-stroke writing alongside the stories behind each character.
Learn how diverse manufacturing processes and design principles turn products from toys to smartphones into scalable production.
Analyze real-world energy markets: international oil, natural gas and electricity pricing, externalities of gasoline, and policy tools for sustainable, equitable energy and carbon reduction.
Learn how optical isolators and circulators prevent cross-talk and feedback in photonic integrated circuits, covering device design, magneto-optical materials, test characterization, and PIC process integration.
Analyze high-Reynolds-number inviscid flows through potential-flow theory, boundary-layer behavior, lift and drag, separation, and transition to turbulence.
Solve the Schrödinger equation for one-dimensional potentials: wavefunctions and probability, square wells and harmonic oscillators, barrier penetration, scattering phase shifts, resonances, and angular momentum.
A discrete mathematics course connecting counting, probability, optimization, algebra, number theory, information theory, and coding through illustrative applied topics.
Explore the mathematics of finance through linear algebra, probability, stochastic processes, and numerical methods applied to markets, portfolio management, volatility modeling, and valuation.
A short video series builds intuition for calculus through big-picture explanations, derivative techniques, and real-life applications.
An in-depth video series linking differential-equation theory with MATLAB’s ODE suite, from phase-plane analysis and Laplace methods to numerical solvers.
Analyze deformation and failure in structures made from elastic, elastic-plastic, and viscoelastic materials using equilibrium and compatibility equations.
Analyze multiaxial stress and strain, failure criteria, and linear elastic structural behavior using energy methods such as Castigliano and Rayleigh–Ritz.
A foundational introduction to how AI agents, machine learning, generative AI, and responsible deployment shape modern artificial intelligence.
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