http://www.micromatic.com/bubbles-beer-glass-aid-364.html <p>The next time you’re served a cold draft beer, and before the first drink, study the glass and observe the bubbles.&nbsp;<br /><br />The Bubbles in a glass of beer will reveal many interesting things. &nbsp;The bubbles will show attributes of the beer style being poured, the cleanliness of the glass and will provide a good indication of the condition of the beer dispensing system.</p>