From Powells.com
You can quench your thirst for knowledge with a good book. But humans cannot live on knowledge alone. In those moments when you crave a good pint of something cool, bubbly, and refreshing, a Powell's pint glass will gladly hold the beverage of your affection. And the Powell's logo on the side of the glass means each sip brings more knowledge into your head. That is a fact — it's scientifically proven to be true (by scientists who had quaffed many delicious libations in their own Powell's pint glasses).