C, C++, and C# programming languages

I think that this deserves more attention.

I concur... They have such a great platform for it. At the moment, I'm just trying to take advantage of what Microsoft has to offer, as far as tutorials and their C# courses. But I would love for some more interactive lessons with what Khan Academy can offer.

Khan academy is a very good platform for coding , I want Khan academy to release courses on other coding languages also .

Thank you Khan academy for providing all of us a free and selfless service 

As an old user of KA I am aware of the challenges with creating content for the C, C++, so on and so forth languages. I have witnessed the growth of Khan Academy from a startup to its current form. I haven't had extra money to help out the cause, but have spread the name and idea of KA through word of mouth for years. I must point out that in the last 20 years (the last 10-15 specifically) the development and growth of the open source robotics, CNC, and 3D printing industry has begun to take hold. I am almost 50 years old and am mentally scrambling to cram as much of this information in my head as I can before my family is left behind the technological curve. It started when I purchased a RepRap design 3D printer. I knew very little about Arduino and all its options/capabilities. I looked it up and learned a little. I then wanted to design my own printable objects and discovered FreeCAD, which completely blew me away (that it is a free, open source program) having worked in the commercial construction industry for nearly a decade. Then the expense of 3D printing hit me. Now I must build an extruder/recycler. Some of the components I need are Arduino based, programmable in the C, C++, and Python Languages. This is not to mention Raspberry Pi. 

I am now learning to program Arduino devices, which are affordable. I am learning about C by reading books available free from Google Books and Amazon, that I read on my phone and tablet. The information is out there, but to have Khan Academy put it all together in one virtual location would kick the tyrants butt down the hallway and out of the castle.

Java and similar programming languages are nice for people who love the screen. C and its offspring should be taught for the people who want to program the world around them. Expanding this into electronics using Arduino with emulators, FreeCAD for 3D parametric design, and creation/use of design slicing programs for the various forms of manufacturing technology might be a good thing as well. As hardware becomes less expensive due to robotic manufacturing, asking students to purchase "lab kits" seems reasonable.

If you've read this far, thank you. I had to get it off my mind. I wish you happiness and time to think for yourself.