'Obelisks' are similar to viroids, the smallest infectious agents. Smaller even that viruses, or depending on one's definition the smallest viruses/ virii if you will. And therefore are not a class of living creatures. I'm not sure why Nature chose this headline.
Previously, I had learned about viroids, as the smallest infectious agents, primarily in plants. However there is one known in humans, Hepatitis D, a viroid that uses Hepatitis B to be able to reproduce, as it would otherwise be incapable. Here's a link to TWIV 979: Flushing out the viroids (https://www.microbe.tv/twiv/twiv-979/). Fascinating.
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