Khan Academy <http://www.khanacademy.org/> now has has more than 1800 mathematics and science tutorial videos online; There are also some humanities videos.

Khan Academy can be accessed via...

...Khan Academy can be downloaded onto a flash drive for viewing on any computer <http://mujica.org/khan/>.

Khan Academy is a reference source for practitioners and learners. Learners can locate all kinds of helpful mathematics and science videos to use when they get stuck on a problem or concept and can't get in touch with their Practitioner(s).

Note: The links above provide alternatives to those who block YouTube.

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