"S" Sounds
Starfall's excellent interactive treatment given to the letter "S s”, with emphasis on the sound of the letter.  Several examples and very clear pronunciation. 
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Avalanche Dogs: Jason O'neill
Meet Jason O'Neill and learn how avalanche rescue dogs work their magic. (1:48)
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17th Street Canal
Explore visits the Ninth Ward district of New Orleans, where in August 2005 rising waters blasted through a levee in the 17th Street canal. Approximately 2,000 people were killed and $84 billion of damages were incurred. (5:20)
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Infectivity Groups
Robert G. Whiddon, Ph.D.
Describes infectivity groups as a method to organize the study of microbiology.
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The Upper Limb Anatomy Wiki

Authors: 
Roisin Kelly-Laubscher & students