![ILLUSTRATION - A glass of Altbier ('old beer'), a dark top-fermented beer traditionally brewed around the city of Düsseldorf, and a glass of Kölsch, a related but lighter style of beer brewed ILLUSTRATION - A glass of Altbier ('old beer'), a dark top-fermented beer traditionally brewed around the city of Düsseldorf, and a glass of Kölsch, a related but lighter style of beer brewed](https://c8.alamy.com/comp/HPFKEP/illustration-a-glass-of-altbier-old-beer-a-dark-top-fermented-beer-HPFKEP.jpg)
ILLUSTRATION - A glass of Altbier ('old beer'), a dark top-fermented beer traditionally brewed around the city of Düsseldorf, and a glass of Kölsch, a related but lighter style of beer brewed
![ILLUSTRATION - A glass of Altbier 'old beer', a dark top-fermented beer traditionally brewed around the city of Düsseldorf, is poured from a tap in a pub in Moers, Germany, 21 February. ILLUSTRATION - A glass of Altbier 'old beer', a dark top-fermented beer traditionally brewed around the city of Düsseldorf, is poured from a tap in a pub in Moers, Germany, 21 February.](https://c8.alamy.com/comp/PC63CA/illustration-a-glass-of-altbier-old-beer-a-dark-top-fermented-beer-traditionally-brewed-around-the-city-of-dsseldorf-is-poured-from-a-tap-in-a-pub-in-moers-germany-21-february-sales-of-klsch-and-altbier-both-regional-specialities-of-the-german-state-of-north-rhine-westphalia-are-in-decline-and-are-now-only-sold-in-large-quantities-during-the-carnival-season-usage-worldwide-PC63CA.jpg)
ILLUSTRATION - A glass of Altbier 'old beer', a dark top-fermented beer traditionally brewed around the city of Düsseldorf, is poured from a tap in a pub in Moers, Germany, 21 February.
![Out with the old! In with the…old? Brettanomyces: A spontaneous phenomenon – BIOL421 @UNBC – Insects, Fungi and Society Out with the old! In with the…old? Brettanomyces: A spontaneous phenomenon – BIOL421 @UNBC – Insects, Fungi and Society](https://biol421.opened.ca/wp-content/uploads/sites/33/2017/03/screen-shot-2016-08-13-at-12-28-03-am.png)