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Interactive Chemistry
[http://serendip.brynmawr.edu/sci_edu/chemsites.html] - - public:time
loads of links to great sources -- rated!
Khan Academy
The Elements of Computing Systems / Nisan & Schocken / www.idc.ac.il/tecs
[http://www1.idc.ac.il/tecs/] - - public:time
from NAND to Tetris in 12 steps. http://video.google.com/videoplay?docid=7654043762021156507&hl=en