A medical numbering system that was contemporary to Roman and Arabic numerals but it never caught on. Although, it was frequently used for encryption prior to 1800.
There has been a study that found that the MMR vaccine cross immunizes for Covid-19. Which if true would neatly explain why kids have been largely untouched by it.
They were, effectively, already vaccinated.
This also raises interesting questions about what the Wuhan lab was doing to Covid-19?
Because I’m telling I worked on Nuclear Biological Chemical at headquarters level and the Chinese response was exactly what I would expect if there was a containment breech and I didn’t know what had gotten out of the lab.