| http://www.w3.org/ns/prov#value | - the time-tested advice regarding watching a video or a clip completely through before showing it to students still applies.A few free sources mentioned in the article are:National Aeronautics and Space AdministrationNational Geographic downloadable podcastsVideos from Wildscreen, a British charity based on Bristol.TeacherTube is a site that provides classroom content and teacher-training resource
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