Virtual Maths, Shapes, Space and Measure, Sine, Cosine, and Tangent
Interactive simulation, formulae for sine, cosine and tangent
Author(s): Leeds Metropolitan University

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Tides
Ocean tides are the rising and falling of the sea due to variations in the gravitational pull of the moon on opposite sides of the Earth. Tides are a type of wave with regular frequencies and periods which echo the motion of the moon.  (03:41)   
Author(s): No creator set

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Training Trainers for Health and Human Rights

Authors: 
Laurel Baldwin-Ragaven & Leslie London