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6 minGeometry lesson4 CQ
The math problem covered in this lesson appeared in an MIT admission test in the year 1869, and is a good test of geometry concepts. Give it a try!
3 minFREEGeometry Nerdy CurioFree2 CQ
As we kick off a new year, let us ponder our we've "shaped" our world. A Nerdy Curio all about flat surfaces, stability, and the power of three.
2 minFREEGeometry lessonFree2 CQ
In this lesson, a young learner helps kids understand a foundational mathematical concept—how to solve for the hypotenuse of a right angle triangle!
19 minFREEAlgebra lessonFree10 CQ
The Pythagorean theorem is one of the most important ideas in geometry. Learn to use Pythagoras’ theorem to solve triangles, diagonals, and more!
5 minFREEGeometry lessonFree3 CQ
Want to know how to find the shortest distance from a point to a line? Math teacher Al Richards demonstrates how using analytic geometry and trigonometry.
9 minFREEAlgebra lessonFree5 CQ
The Pythagorean theorem is an essential mathematical equation used in the study of algebra and geometry. Learn how to use it to solve for different variables.
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325 min3-part Biology course14 CQ
Preparing for the AP Biology exam? In this three-part course, get clear explanations of Darwinian evolution by natural selection, modern evolutionary theory, and the history of life on Earth.
7107 min7-part iOS Development course57 CQ
Looking for a programming language that can do some heavy-lifting but doesn't take years to master? When programming for iOS, OS X, and watchOS, Apple's programming language Swift is the best choice!
11163 min11-part iPhones + iPads course88 CQ
Want to get the most out of your iPhone? This course from tech expert Todd Olthoff is the perfect guide, for everything from basic installation to built-in app features.
41572 min41-part Arduino course303 CQ
Want to build a new robot friend? How about create a cool LED sign? Whatever the gadget may be, get started with this beginner-friendly Arduino course from Open Source Hardware!
1270 min12-part Science course41 CQ
If you're looking for fun activities for kids that are equal parts science and craft, you'll love this course with lessons covering everything from homemade oobleck to egghead gardens.
4104 minFREE4-part Engineering courseFree54 CQ
Building a computer from scratch? Watch how to do each step from start to finish—from choosing the right computer hardware, to installing the motherboard, to booting up your new DIY computer!
11110 min11-part Computer Science course61 CQ
Learn how to set up a do-it-yourself home wireless network in this course. From terminology and equipment to setup and best practices, this hands-on IT course teaches how to build a wifi network.
958 min9-part Engineering course32 CQ
Sensors perform a hugely valuable function in electronic devices, and in this course, electrical engineer Dorian McIntire provides an in-depth look at how different kinds of sensors operate.
1582 min15-part Engineering course50 CQ
In this course, learn what defines the discrete-time Fourier transform, how it is related to different signal functions, as well as how to evaluate its properties numerically and graphically.
633 min6-part Engineering course20 CQ
Are you an electronics hobbyist who wants to start building simple electronic circuits with LEDs? This course is a great way to apply a circuitry foundation and learn a bit of electrical engineering!