Whirling Disease in fish is caused by a tiny parasite. But what is that parasite and just how tiny is tiny? The answers will astound you!

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Music

Opening & Closing Themes: Running Waters and Acoustic Meditation by Audionautix (Jason Shaw), from audionautix.com. CC BY 3.0.

Modified versions of: On The Highway, Age, Angled Insight and Unforeseen Space by Unheard Music Concepts, CC BY 4.0