Best Science & Engineering courses
The 150 Science & Engineering courses programmers recommend to each other on Hacker News, ranked by how many people recommended each one, how strongly, in how many separate threads and over how many years (207 recommendations, 2006 to October 2026). 96 of them are free. How ranking works.
Introduction to Biology - The Secret of Life
edX · beginner · free
Commenters call it one of the best MOOCs they have taken, praising Eric Lander's lectures and its clear, well-explained approach to how biology's discoveries were made.
The Feynman Lectures on Physics
Caltech · intermediate · free
Commenters call it an amazing introduction to undergraduate physics and say it sparks enthusiasm for the subject, though one notes it is better for inspiration than as a primary teaching text.
Underactuated Robotics
MIT OpenCourseWare · advanced · free
Commenters call it one of the best robotics courses they've taken and praise instructor Russ Tedrake as an amazing lecturer.
For the Love of Physics (Walter Lewin)
MIT OpenCourseWare · beginner · free
Commenters call Lewin a captivating, clear teacher whose lectures make you feel like you are discovering physics alongside him.
6.002 Circuits and Electronics
MIT OpenCourseWare · beginner · free
Commenters call the lecture videos very good and describe them as a godsend for learning circuit basics, with one pointing to the MITx version as super interactive.
Discrete Differential Geometry
Carnegie Mellon University · advanced · free
Commenters call it an accessible route into advanced geometry topics, praising Crane for making them easy to follow and for the freely available videos and notes.
8.04 Quantum Physics I
MIT OpenCourseWare · intermediate · free
Commenters call it an excellent introduction to quantum physics, with one recommending both professors' versions and another praising its clear analogies.
Medical Neuroscience
Coursera · intermediate · free
Commenters call it one of the best courses available online and say the professor is a great teacher whose lectures are easy to listen to and learn from.
CS 161 Computer Security
UC Berkeley · intermediate · free
Commenters call it a great course with excellent course notes and slides, and praise the Berkeley security instructors (Wagner, Weaver).
Russell Barkley ADHD lectures
YouTube · intermediate · free
Commenters call Barkley an excellent, pragmatic expert who explains ADHD in clear medical terms and shows it is more than attention problems.
8.02 Electricity and Magnetism (Walter Lewin)
MIT OpenCourseWare · intermediate · free
Commenters point to Walter Lewin's clear, intuitive video lectures as a strong resource for learning electromagnetism, and one suggests following along with it and doing the exercises.
Quantum Computation (Ph219) lecture notes
Caltech · mixed · free
Commenters call Preskill's notes invaluable and amazing, praising their coverage from basics to advanced concepts and their explanation of decoherence.
Quantum Computing Since Democritus
Scott Aaronson (MIT) · intermediate · free
Commenters call Aaronson's lectures excellent and always worth reading, and point to specific lectures for clear intuition on topics like time travel paradoxes and probability puzzles.
Computational Neuroscience
Coursera · intermediate · free
Commenters call it a good starting point for software developers moving into brain research, and one who is not a neuroscientist found it really good.
Foundations of Blockchains
Coursera · advanced · free
Commenters call it rigorous and very well explained, and recommend it as the background for understanding blockchain and consensus theory.
Statistical Mechanics: Algorithms and Computations
Coursera · intermediate · free
Commenters call it an excellent, highly recommended course with clear explanations and many Python programs, and one calls its first lecture a favorite introduction to Markov chain Monte Carlo.
8.05 Quantum Physics II
MIT OpenCourseWare · advanced · free
One commenter calls it an advanced quantum physics course they highly recommend, and says that doing the problem sets teaches quite a bit.
2.008x Manufacturing Processes and Systems
edX · beginner
Commenters call it a great overview of all types of manufacturing and a good place to start for learning the field.
The Human Brain
MIT OpenCourseWare · beginner · free
Commenters say it is pitched at a high level, is easy to follow without a biology background, and is absolutely amazing if you have the time.
Behavioral Evolution (Robert Sapolsky)
YouTube · intermediate · free
Commenters say the lectures are worth watching in full and recommend them for the evolution of cooperation and related subjects.
Bioinformatics Specialization
Coursera · intermediate · freemium
Commenters call it a fantastic course series for learning bioinformatics algorithms and suggest it as the starting point for self-learners.
The Mechanical Universe
Caltech · beginner · free
Commenters call it a highly regarded, excellent video series that still holds up well, and point out that Caltech provides it free on YouTube.
Everyday Engineering: Understanding the Marvels of Daily Life
The Great Courses · beginner · freemium
Commenters suggest it for anyone curious about the engineering behind ordinary objects, and one says it is used in an introductory engineering course.
15-462 Computer Graphics
Carnegie Mellon University · intermediate · free
Commenters recommend it as a free, high-quality way to learn the math and fundamentals of computer graphics, with one noting the Scotty3D starter codebase is a great way to explore the material.
Quantum Computing
Coursera · mixed
Commenters describe the classes as "really good" and say the course is worth taking for quantum computation over vendor-specific certifications.
Plasma Physics and Fusion
edX · intermediate · free
Commenters point to it as one of edX's distinctive courses not available elsewhere, and one suggests it gives useful context on the feasibility of fusion reactors.
Aeronautics and Astronautics
MIT OpenCourseWare · mixed · free
Commenters point to it as a source of introductory aerospace material and to a specific engineering course on the Space Shuttle's design.
8.03 Physics III: Vibrations and Waves
MIT OpenCourseWare · intermediate · free
Commenters describe MIT OCW as remarkably complete and of higher quality than many university offerings, and one points to a specific lecture on the physics of rainbows.
Biology
Khan Academy · beginner · free
Commenters call the just-plain-Biology course a surprisingly useful overview, and recommend its genetics and cell signaling units as accessible starting points.
7.012 Introduction to Biology
MIT OpenCourseWare · beginner · free
Commenters call it a great introduction to how biochemistry and genetics joined to form modern biotech, and praise Eric Lander as a great lecturer.
The Higgs Boson and Beyond
The Great Courses · beginner · paid
Commenters describe it as an accessible, informative and entertaining chronology of the Higgs boson, and one calls it a favorite video on the topic.
3.091 Introduction to Solid State Chemistry
edX · intermediate · free
Commenters call it a good, non-dumbed-down introduction to solid state chemistry and a gateway to materials science, with the online version closely matching the on-campus course.
6.857 Network and Computer Security
MIT OpenCourseWare · intermediate · free
Commenters call it probably the best class they've taken and say it is very hands-on, teaching students to build more secure systems.
Dark Matter and Dark Energy
YouTube · beginner · free
Commenters describe it as a 12-hour pop-sci lecture series that explains the evidence behind the cosmologists' view, useful for anyone who wants to understand the claims before disputing them.
Principles of Biochemistry
edX · intermediate · free
One commenter says it is "very good" and notes that a good knowledge of organic chemistry is a prerequisite.
Medicinal Chemistry: The Molecular Basis of Drug Discovery
edX · beginner · free
Commenters describe it as an interesting, accessible MOOC on medicinal chemistry, though one notes it focuses more on synthetic chemistry than natural-product discovery.
Scientific Computing
Coursera · intermediate · free
Commenters suggest it for exploring the scope of scientific computing, and one notes that leading researchers in the field teach it.
Michael Levin Lectures
YouTube · mixed · free
One commenter says they "wholeheartedly recommend" watching Levin's lectures, calling them "both illuminating and fascinating" and noting there are a great many of them.
SuperCollider intro course
YouTube · beginner · free
Commenters call Eli Fieldsteel's intro to SuperCollider fantastic and share the playlist as a starting point for the language.
AWS Certified Solutions Architect course
Adrian Cantrill · beginner · paid
Commenters say Adrian Cantrill's courses are in-depth and easy to understand.
Nano Science and Engineering
NPTEL · mixed · free
One commenter calls it the best cycle of lectures they have seen in open access from the Centre for Nano Science and Engineering in Bangalore.
Climate Modeling (PS280x)
edX · intermediate
One commenter, who took it a few years ago, calls it fantastic for digging deeper into how greenhouse gas absorption and related climate physics are handled.
Brain Health and Nootropics Weekend Seminar
Stanford · beginner
One commenter strongly recommends it, calling it fantastic and saying the class was so cool, with students ranging from age 25 to 90.
Arithmetic, Population and Energy (Albert Bartlett)
YouTube · beginner · free
Commenters describe it as absolutely amazing and say it changes how you see the news, though the only comment here mentions it briefly as a lecture video worth including.
Crash Course Astronomy
YouTube · beginner · free
One commenter calls it brilliant and says they learned a lot from it, so they highly recommend it.
Physics for Future Presidents
UC Berkeley · beginner · free
Commenters call it the best course or book for building intuition about energy and physics estimates, and describe it as very worthwhile.
Modern Robotics
Coursera · intermediate
Commenters highly recommend it as a companion to the free textbook, praising the author's clear visual explanations.
Statistical Molecular Thermodynamics
Coursera · advanced
One commenter lists it among the best MOOCs they've taken, calling it mind-expanding while noting it involves some calculus.
The Chemical History of a Candle
YouTube · beginner · free
Commenters call it a truly excellent lecture series despite its age, noting that it keeps Faraday's original language, which takes some getting used to.
Order-of-Magnitude Physics (Art of Approximation)
edX · intermediate
Commenters say it made them fearless about unfamiliar math problems and changed their intuition for numbers, and one credits it with helping them in job interviews.
Quantum Mechanics for Quantum Computing
edX · intermediate
One commenter says they highly recommend it, a single endorsement with no further detail on what makes it stand out.
A Life of Happiness and Fulfillment
Coursera · beginner
Commenters describe it as highly recommended and say it gave them useful insights into how motivations affect happiness, with one saying it changed them for the better.
Origins: Astronomy, Geology, Life, and the Universe
Coursera · beginner
A commenter loved it for covering a wide range of science disciplines in a chronological, one-theme-per-week structure.
Understanding the Universe
The Great Courses · beginner · paid
Commenters describe it as a wonderful set of lectures that explains astronomy well and is highly recommended for laypeople interested in the subject.
Bioinformatics II
Coursera · intermediate · free
Commenters describe it as one of the most enjoyable Coursera courses they've taken, praising how it applies algorithms to a non-CS field.
Bioinformatics Algorithms
Coursera · intermediate · free
A commenter calls it one of the most interesting things they did in a year and highly recommends it, noting its problem sets come with a textbook and lectures.
Cosmic Evolution
Harvard Extension School · mixed · paid
A commenter calls it an excellent course on the history of the universe and highly recommends it alongside the readings, though only for those able to attend in the Boston area.
Astronomy 141: Life in the Universe
Ohio State University · beginner · free
One commenter highly recommends it as a podcast series and shares its overview, noting it is an introduction to astrobiology.
Photographic Technology (Dick Lyon lectures)
Google · intermediate · free
Commenters recommend it as a deep, engineering-oriented treatment of the science behind digital photography, beyond typical photography instruction.
Color Course Notes (Maureen Stone)
SIGGRAPH · intermediate · free
Commenters describe it as something pretty accessible and good that gives a more accurate grounding in color than traditional color-theory material.
Sensors (Dan Gelbart)
YouTube · free
One commenter points to a specific lecture as a detailed explanation of RF-based detection methods, noting it is worth watching in full.
3D Renderer Course (Gustavo)
Unspecified · paid
One commenter calls Gustavo's lectures great and says they bought the 3D renderer course after working through his compiler lectures.
Precision Engineering (Alex Slocum)
YouTube · free
Commenters mention it as a great course on precision engineering by Alex Slocum, pointing to it alongside a list of machining YouTube channels.
Dr Rege Lectures
YouTube · mixed · free
Commenters call Dr Rege's explanations very clear and point to them as a better use of time than the forum discussion for anyone interested in the subject.
The Story of Earth
The Great Courses · beginner · paid
One commenter highly recommends Robert M. Hazen's Great Courses lectures and accompanying book, in the context of Earth's oxygen history and life.
Quantum Mechanics Lectures (Sean Carroll)
YouTube · beginner · free
A commenter says that for a layman who wants to know what the cat thing is about, Carroll's lectures will at least let you ask better questions, and recommends the Q&A videos too.
Watch Repair Course (Mark Lovick)
WatchFix · beginner · paid
A commenter highly recommends it as the next step after watching free watch repair videos on YouTube, saying it teaches all you need to know about tools, lubricants, and techniques for servicing most movements.
CS 178: Digital Photography (Marc Levoy)
Stanford University · intermediate · free
One commenter calls Levoy's Stanford lectures a more serious introduction to digital photography than a short HDR video, after learning how cameras work as a physicist.
Precision and emergence in the physics of life
YouTube · advanced · free
Commenters point to it as a deep dive by William Bialek on how mathematics applies to messy biological systems like neurons, cells, and birds.
General Chemistry
edX · beginner
Commenters say the General Chemistry courses on edX are really good, with a quiet forum still visited by MIT staff and high-quality exercises.
Self-Determination Theory
Coursera · beginner · free
Commenters describe it as a free introduction that suits newcomers better than the dense academic books on the theory.
16.885J Aircraft Systems Engineering
MIT OpenCourseWare · advanced · free
A commenter calls the video lecture recordings amazing for demystifying the Space Shuttle.
Hardware Design (MIT IAP)
MIT OpenCourseWare · intermediate · free
Commenters praise its lectures and the breadth of content packed into a short IAP session, and point to its useful reference recommendations.
Soil Science
Cornell University · beginner · free
A commenter calls it an excellent soil science course available online.
Electronics
Khan Academy · beginner · free
One commenter suggests it for people who want to understand the science behind electronics, alongside hands-on breadboard practice.
6.0.31
MIT OpenCourseWare · free
One commenter says some excellent courses are one-to-one copies of OCW courses such as 6.0.31, contrasting them with weaker EdX offerings.
Rapid Prototyping
Georgia Tech · intermediate
One commenter calls the Georgia Tech "Rapid Prototyping" course awesome, noting it teaches enough electronics to build practical gadgets.
Analog Circuits (Behzad Razavi)
YouTube · intermediate · free
A commenter calls Prof. Razavi's lectures great, recommending them as a good track for learning analog electronics.
CS6750 Human-Computer Interaction
Georgia Tech · advanced · free
Commenters praise it for teaching something new with interesting underlying theory, and note that its lectures are free.
Technology, Engineering, and Architecture in the Ancient World
The Great Courses · beginner · paid
Commenters point to it as a substantial lecture series, noting that its presentation is spartan but its content is very substantial.
Chemical Reaction
Brilliant · beginner · paid
One commenter says they have been working through Brilliant's chemistry courses and enjoyed the lessons, such as the one explaining how silvering a mirror works.
Robert Sapolsky Lecture Series
The Great Courses · intermediate · paid
Commenters point to Sapolsky's nature-versus-nurture treatment as a nuanced account that avoids both genetic determinism and the claim that parenting doesn't matter.
Mechanical Watch Ideas (Gerald Sussman)
YouTube · free
One commenter calls it a great video lecture and recommends it as a reminder of Sussman's MIT teaching on mechanical watches.
Intro to Traffic Flow Modeling
edX · beginner
One commenter recommends it as a way to understand the theory behind traffic simulation and some counterintuitive applications, such as deliberately slowing traffic at certain points to increase overall throughput.
Systems Biology Specialization
Coursera · intermediate · paid
One commenter who took it over several years says the Coursera courses were of much higher quality than what they got from a local university, though it is mostly conceptual and historical rather than state of the art.
Population Genetics (Graham Coop)
UC Davis · intermediate · free
A commenter calls Coop's lectures the best real overview of current population genetics and says his teaching materials were inspirational for many people.
Altium Designer
Udemy · mixed · paid
The commenter calls Robert's course top notch and says they enjoyed it as a refresher for daily Altium users.
Rick Beato Ear Training Course
Rick Beato · paid
One commenter calls it a good deal, noting that 100 modules for $119 is far cheaper than private lessons at $20-$25 per half hour.
Electronics (Professor Fiore)
Monroe Community College · beginner · free
One commenter calls it a good pick for basic circuits and electronics because it is comprehensive and comes with free lecture videos, textbooks, and lab manuals.
Software Defined Radio for Engineers
Analog Devices · intermediate · free
Commenters call it a great resource for learning SDR and note it assumes an EE background, so it suits engineers who already have the fundamentals.
Feynman's Lectures on Gravitation
Caltech · advanced · free
The commenter recommends it for a microscopic, graviton-based derivation of gravity that reaches Einstein's equations, calling the approach very interesting and the style beautiful despite its mistakes.
Introduction to Complexity
Santa Fe Institute · beginner
Commenters say they enjoyed it and point to its broad overview of how complex systems emerge from simple phenomena and its cross-disciplinary insights.
Biology Everywhere: Foundation
Coursera · beginner
One commenter recommends it as an entry-level course for someone who wants to revisit biology, praising the instructor's approach.
ASTR 160 Astronomy
Yale University · beginner · free
One commenter says they watched it online and calls it a great class.
The Origin and Evolution of Earth
The Great Courses · beginner · paid
One commenter says the course covers much of the same material as Hazen's book and, used together with it, left them with strong retention of the subject.
Quantum Computation and Information (Ryan O'Donnell)
Carnegie Mellon University · intermediate · free
Commenters call it the best option for those who want to really understand what quantum computing can do, with practice in the underlying math and intuition for multi-qubit systems.
The Science of Mindfulness
The Great Courses · beginner · paid
One commenter points to it as the place to learn the science behind how meditation changes the brain, after recommending guided meditation recordings.
Back-of-the-Envelope Physics
Stanford University · intermediate
One commenter calls it an excellent physics course, citing a first-day exercise estimating how much to feed a baby modeled as a spherical heat emitter.
EE359 Wireless Communication
Stanford University · advanced · free
One commenter points to it as the place to go for terrestrial wireless communications, noting that the lectures and a draft of Goldsmith's book are available.
Analog Electronics: Circuits, Diodes and Transistors (Bonnie Ferri)
Coursera · beginner
One commenter says they recently enjoyed the three-part course, which assumes no electronics background and is adapted from a Georgia Tech class.
EE201 Electronic Circuits
Iowa State University · intermediate · free
Commenters point to it as a useful college-level outline of the important topics for someone learning electronics, though they note its lecture notes are not written as a standalone tutorial.
Understanding Genetics
The Great Courses · beginner · paid
One commenter calls it a nicely produced course to start with for anyone wanting to learn the actual science behind genetics rather than a simplified overview.
MOSFET Models
Coursera · advanced
A commenter calls it an excellent online course for anyone wanting to understand what transistor models are like.
Fundamentals of NetLogo
Santa Fe Institute · beginner · free
The commenter says they have taken several SFI courses and describes them as top notch, and notes the courses are free to access now that they have elapsed.
Introduction to Agent-Based Modeling
Santa Fe Institute · beginner · free
One commenter says they have taken several SFI courses and calls them top notch, and notes the elapsed courses can be taken free after logging in.
8.012 Physics I
MIT OpenCourseWare · beginner · free
One commenter, who self-studied through MIT OCW, recommends the series as giving the core theoretical knowledge of a physics major and calls OCW remarkably complete.
8.022 Physics II
MIT OpenCourseWare · beginner · free
One commenter who self-studied through MIT OCW calls the material remarkably complete and says its lecturers are often better than those at most universities, and recommends the 8.022 course as part of the core physics series.
CS 6620 Computer Graphics
University of Utah · advanced
One commenter suggests it as the way to get a traditional Utah graphics curriculum, noting the material is updated from the older course.
Computational Photography
YouTube · intermediate · free
One commenter points to it as a great series of lectures on the theory behind Pixel's computational photography.
Nutrition Made Clear
The Great Courses · beginner · paid
A commenter recommends it as a nutrition course rather than a dieting advice book, noting the instructor's sports nutrition background gives many of the examples.
Genetics
Khan Academy · beginner · free
One commenter calls the Genetics course useful as part of a set of Khan Academy biology classes, though they suggest skipping the parts on animal cross-breeding.
Radio Astronomy
The Great Courses · beginner · paid
Commenters describe it as an interesting watch for anyone curious about science and astronomy, highlighting the fascinating technology behind the Green Bank telescopes.
Light, Spike, & Sight: The Neuroscience of Vision
edX · intermediate · free
The only commenter calls it an excellent MOOC on the visual system, mentioning it in passing while discussing whether perception is shared between people.
Understanding Complex Systems
The Great Courses · beginner · paid
One commenter recommends it as a follow-on to Thinking in Systems, pointing to the course by Scott Page of the Santa Fe Institute.
Applied Computational Genomics
Quinlan Lab · intermediate · free
Commenters recommend it as an excellent option for learning practical, hands-on computational genomics and bioinformatics skills.
Stanford Topics in String Theory (Leonard Susskind)
YouTube · advanced · free
Commenters point to Susskind's lectures as a clear way to see black hole horizon physics illustrated with Penrose diagrams.
Robotics Software Engineer Nanodegree
Udacity · intermediate · paid
One commenter highly recommends it as one of Udacity's recent paid-only robotics courses, and points to a self-driving car project completed in a related nanodegree as an example of the work.
The Quantum Computational Universe (Patrick Hayden)
YouTube · intermediate · free
One commenter recommends it as an accessible route into quantum information ideas behind black hole research, pointing to specific introductory and follow-up lectures.
Quantum Fields and Strings: A Course for Mathematicians
Institute for Advanced Study · advanced
One commenter calls it a fantastic two-volume collection and says it is the best attempt they know to present the mathematics of these topics in one place.
The Addictive Brain
The Great Courses · beginner · paid
One commenter calls it an overview of current thinking that changed their view, noting that dopamine does not play the role they had assumed in addiction.
Blockchain
edX · beginner
One commenter, a long-time AI practitioner new to blockchain, says they can recommend the edX blockchain classes.
Quantum Theory (Frederic Schuller)
YouTube · advanced · free
Commenters recommend it alongside Brian Hall's book as a rigorous, mathematically clear treatment of quantum theory.
Chemistry
Khan Academy · beginner · free
One commenter suggests it for getting up to speed on "just chemistry" and says the explanations are pretty good and easy to pick from by interest.
Circuits and Electronics 2: Amplification and Active Circuits
edX · intermediate · free
Commenters point to it as part of the MIT sequence on edX for learning electronics on your own, noting it is taught by the edX CEO and is the flagship course.
Self-Driving Cars
Coursera · intermediate
Commenters call it a great course on self-driving cars and say it is worth the effort even if you need to pick up linear algebra and Python along the way.
Eric Kandel lectures on memory and the brain
YouTube · mixed · free
One commenter calls Kandel's lectures on this subject "wonderful" and says they are easy to find on YouTube.
Leonard Susskind lectures on AdS/CFT
YouTube · beginner · free
One commenter recommends them as the math-free option that is easy to watch and avoids nonsense, since most popular AdS/CFT material is poor.
Data Driven Astronomy
Coursera · beginner · freemium
Commenters recommend it as a fun introduction to radio astronomy and data analysis that covers pulsars and related topics.
Understanding Modern Electronics
The Great Courses · beginner · freemium
One commenter suggests it as a starting point for basic electronics, noting that The Great Courses offers a free month-long demo to watch the content online.
ECE 5745 Complex Digital ASIC Design
Cornell University · advanced
One commenter points to it as a good online course explaining the full ASIC process from RTL to GDSII, alongside Berkeley and MIT courses.
Virtual Reality (Steven LaValle)
University of Illinois Urbana-Champaign · mixed · free
A commenter calls it an amazing course for anyone wanting to learn VR, and recommends it alongside graphics course links.
Fundamentals of Neuroscience
Harvard · beginner · free
Commenters recommend it as the starting point before moving on to deeper neuroscience material, describing it as a free, high-quality multimedia course.
Nature in Code: Biology and Javascript
edX · intermediate · free
One commenter recommends the MOOC and its book together for learning evolutionary dynamics through JavaScript simulations.
7.28 Molecular Biology
MIT OpenCourseWare · intermediate · free
Commenter calls it well-organized and a great use of time for learning the field, though not focused on the latest topics.
Autonomous Navigation for Flying Robots
edX · advanced
One commenter calls it a good course from TUM's computer vision group, noting it was one of the few online offerings from that university.
Trauma Surgery
Coursera
One commenter, in passing, says it "was really good too," citing it as one of TUM's few online course experiments.
Physiology lectures (Aaron Mullally)
YouTube · beginner · free
Commenters praise the lecturer's engaging delivery, saying they could listen for hours and actually learn, unlike more polished productions.
Science and Cooking: From Haute Cuisine to Soft Matter Science
edX · beginner · free
A commenter calls it an excellent MOOC taught by a strong lineup of food-science figures and chefs.
Classical Physics (V. Balakrishnan)
YouTube · advanced · free
Commenters call the lecture series amazing and incredibly dense with insight, though one notes it is not a graded course with problem sets.
How to Make (Almost) Anything
MIT OpenCourseWare · mixed · free
The commenter calls it one of the best courses at MIT and says they regret never taking it, though they only mention it in passing alongside Gershenfeld's other course.
Audio Electronics
Coursera · beginner
Commenters praise it for starting from absolute scratch and giving a solid understanding of everything up to building an amplifier, blending theory and practice.
Quantum Mechanics
MIT OpenCourseWare · intermediate · free
One commenter, returning to the subject after two years away, calls MIT OCW's quantum mechanics courses "pretty great" for refreshing the material.
Intro to Astronomy
The Great Courses · beginner · paid
One commenter calls it the "wonderful" Great Courses intro to astronomy series and says it is highly recommended.
ADHD
Coursera · beginner · free
Commenters call it a very good MOOC and point to it as a resource for anyone wanting to understand the evidence that ADHD exists.
CS184 Foundations of Computer Graphics
edX · intermediate
One commenter recommends it for anyone interested in learning more about computer graphics, while noting it uses some deprecated OpenGL but is still quite worthwhile.
CS291 Introduction to 3D Rendering
Udacity · beginner
One commenter recommends it as a starting point for anyone seriously interested in learning 3D rendering who already has programming and linear algebra experience.
Introduction to Chemistry (Donald Sadoway)
MIT OCW · beginner · free
Commenters describe his intro chemistry lectures as excellent, entertaining, and freely available online.
FUNdaMENTALS of Design
MIT OpenCourseWare · beginner · free
Commenters suggest it as a resource for people trying to understand hardware on their own, in the context of a discussion about bills of materials and manufacturing.
MCB 140 General Genetics
UC Berkeley · intermediate · free
Commenters point to it as an example of a full university course whose lectures and materials are freely available online.
Introduction to Solid State Chemistry
MIT OCW · intermediate · free
A commenter calls Sadoway's lectures excellent and suggests them for anyone with time and an interest in chemistry and its history.