Ted Ed TED-Ed is TED’s youth and education initiative. TED-Ed’s mission is to spark and celebrate the ideas of teachers and students around the world.

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HowStuffWorks explains thousands of topics, from engines to lock-picking to ESP, with video and illustrations so you can learn how everything works.

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Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom.

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DOF simulator Calculates camera depth of field and background blur and simulates it on a photo for any lens, camera and distance combination with different types of lens blur.

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Tinkercad Start designing in 3D. If you can dream it, you can build it. From product models to printable parts, 3D design is the first step in making your ideas real.

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