Maths video rankings on iTunes U

I have discovered some iTunes U ranking pages for the maths videos and maths collections.

See (free iTunes software required)

http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewTop?genreId=40000077&id=29661&popId=36

for the “top 200” iTunes Maths Collections

and

http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewTop?genreId=40000077&id=29661&popId=40

for the “top 200” maths video downloads.

What “top 200” means on iTunes is not obvious. It apparently involves a complicated combination of factors. Does anyone have any detailed information on this?

The top downloads are currently dominated by: Harrisburg Area Community College, especially Susan Cooper; MIT, especially David Jerison;  Cambridge University, especially James Grime; and a variety of videos from Imperial College London.

Apparently James Grime recently passed 10,000 YouTube subscribers for his singingbanana collection. (See http://www.youtube.com/user/singingbanana)

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