Man, if could rename this to just "the beer thread" the world would be right.
Anyway...some science to it all. Alcohol evaporates quite readily (at room temperature) compared to water. Your average beer is 4-5% alcohol by volume, so you're looking at a minuscule difference between the overall evap. rate between water and ... any kind of beer.
to move it on, here's what I got going on tonight...
No way I had to put the word mg42 for the saga to continue