Some video resources if you need to explain scientific topics to students (or need something explained to you!)
iBioMagazine.org features short (<15 min) talks that highlight the human side of research. iBioSeminars.org provides approximately hour-long seminars by high profile researchers.
Professor Emeritus of Biology Hugh Huxley discusses the sliding filament theory of muscle contraction in a November 2011 video from iBiomagazine.org
Professor of Biology Jim Haber discusses Mechanisms of DNA Repair in a 2009 video from iBioseminars.org
Science at Brandeis 