| http://www.w3.org/ns/prov#value | - Electromagnetic waves in general, and we study them in a whole lot of situations, including nipping along unfettered in free space, in conducting materials (where it penetrates for a while before dying away), at interfaces between different kinds of materials (we learn why metals are shiny quite readily this way, for example), and then there is the business of forcing the wave to propagate down a
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