Title: Valgfritt

Text: The comparison between the wave theories of sound and light was so productive that scientists spent a great deal of effort looking for a medium that would propagate light the way air propagates sound. They even gave it a name, "ether," but they never found the medium. The analogy that had been so fruitful in some ways proved to be misleading in this case. Hver avsnitt vil være en test.

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