This is an interesting fact I've just discovered:
https://www.nature.com/articles/nrmicro.2016.177
https://www.nature.com/articles/nrmicro.2016.177
To help conceptualize the sheer number of viruses in existence, their current biomass has been estimated to equal that of 75 million blue whales (approximately 200 million tonnes) and, if placed end to end, the collective length of their virions would span 65 galaxies
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