Belgium. Today there are eight active Trappist breweries - 6 in Belgium, 1 in the Netherlands, and 1 in Austria.
When beer is poured into a glass, why do some bubbles go down instead of up?
Bubbles are lighter than beer, so it would make sense for them to rise upward, but it has been found that bubbles go down as well. Bubbles head up in the center where fractional drag from the glass is less and down on the outside as the top gets crowded.
Originally published in our Micro Brew News' Trivia Time, Peak Organic Brewing edition.