Originally Posted by Greyhaven
Is it true Guiness and Bud have the same gravity? - If so, why in God's green earth do I care.
I'm not exactly sure what context "gravity" is used for. In terms of alcoholic beverages, it usually refers to the quantity of alcohol per volume.
Guiness is a rather light beer, in terms of taste and alcohol percentage. The most well-known Guiness is the creamy one, which only difference with a Guiness that has a more watery texture like a "normal" beer is that nitrogen is being added to the keg and/or pushed to the tap by nitrogen. Being a heavier gas then carbon dioxide, it makes the texture we all came to know.
Any given beer can thus become a cream ale if nitrogen is being added. It does modify the taste of the beverage which makes some die-hard beer snobs hate the thing. It concentrates metalised tastes and hides some flavors as well.