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# Black cow

A black cow (also known as a brown cow or a root beer float) is a non-alcoholic cocktail made of

Put the scoops of vanilla ice in a high ball glass, pour the root beer over it. Serve with a straw.

 Golden ratio ... phi, is the number $\phi = \frac{1 + \sqrt{5}}{2} \approx 1.6180339887...$ the unique positive real number with [itex]\phi^2 = ...