I read from dree to dress.

"D region" is also called "D layer"

https://en.wikipedia.org/wiki/Ionosphere

The word of the episode is "dreidel".

https://en.wikipedia.org/wiki/Dreidel

Theme music from Jonah Kraut

https://jonahkraut.bandcamp.com/

Merchandising!

https://www.teepublic.com/user/spejampar

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