I read from echiuroid to echovirus.

The full clip from American Pie can be watched here:

https://youtu.be/rvtBb1FFUa8

Just like most of Greek Mythology, the story of Echo the Nymph is sad.

https://en.wikipedia.org/wiki/Echo_(mythology)

Get out of the echo chamber if you can!

https://en.wikipedia.org/wiki/Echo_chamber_(media)

"echovirus" stands for "enteric cytopathic human orphan virus". 

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

From the NIH, "The term 'orphans' is used to designate those viruses which cannot definitely be associated with any recognized disease syndrome."

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2555328/

The word of the episode is "echo".

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

It seems like echo in a radio signal is literally just a radio signal bouncing off of an object and returning to the source that sent the signal which is RADAR!

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

Yes, of course ducks' quacks echo, but they are quite quiet. 

https://www.theguardian.com/science/2003/sep/08/sciencenews.theguardianlifesupplement

Theme music from Tom Maslowski

https://zestysol.com/

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