Cuz we love to talk.
And we talk too much.
So according to a Japanese study published in the journal, Physics of Fluids, SARS-Co-V-2 can be ejected in aerosol form from an infected person merely by talking.
Now clearly, there would be other factors involved in an infected person passing their infection on to someone else but still, the more you talk, and the closer you are to a 2nd person, if you are infected, the more likely it is that you may pass that infection on.
So always wear a mask in a higher-risk setting.
And don’t talk so much.
You will seem smarter that way, too.