Scroll down to section 5 if you're in a hurry.
Thanks. 
But a steady wind at your back on a sunny day is better if you are the uninfected.
Scroll down to section 5 if you're in a hurry.
For everyone wanting real science and real physics, see my above link.
Scroll down to section 5 if you're in a hurry.
Thanks. But a steady wind at your back on a sunny day is better if you are the uninfected.