Just a nit: beer never had loads of NO2. So-called "nitro" pours are pushed with nitrogen gas (N2), not NO2. This is a good thing, since NO2 is rather toxic: ht

Just a nit: beer never had loads of NO2. So-called "nitro" pours are pushed with nitrogen gas (N2), not NO2. This is a good thing, since NO2 is rather toxic: https://en.wikipedia.org/wiki/Nitrogen_dioxide https://en.wikipedia.org/wiki/Nitrogen_dioxide