The consensus was that there was a sharp cutoff between large particles (fall out of the air, transmit virus) and small ones (float around but doesn't transmit)

The consensus was that there was a sharp cutoff between large particles (fall out of the air, transmit virus) and small ones (float around but doesn't transmit). It turns out this is not really based on anything other than tradition. https://royalsocietypublishing.org/doi/10.1098/rsfs.2021.0049 https://royalsocietypublishing.org/doi/10.1098/rsfs.2021.004...