Khan Academy

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Khan Academy is an educational resource developed by an eponymous private nonprofit headed by educational entrepreneur Salman Khan. The resource includes a large number of videos prepared by Salman Khan.

Video attributes

Attribute Value
Length of videos Typical videos are 5-12 minutes long, though there are some videos that are as long as 20 minutes.
Lecturer shown? No, voice-over
Format of presentation Electronically recorded writing on a tablet (Camtasia software)
Subtitles and closed captioning? Available for most videos in English. Available for some videos in other languages.
Voice translations? Available for a few videos in other languages.
Subjects covered? Wide range of subjects. Most comprehensive coverage is of mathematics.