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An ice cream float, often called a 'spider' in Australia and New Zealand, is a classic dessert beverage made by scooping vanilla ice cream into a glass of carbonated soft drink. The most common version features cola, but it is also popular with root beer, ginger ale, or lemon-lime soda. Originating in the late 19th century United States, it is a staple of American soda fountains and diners.
This treat is very high in carbohydrates and added sugars, with a moderate amount of fat coming from the dairy in the ice cream. A typical serving contains roughly 250 to 350 calories, providing a quick energy boost but offering little in the way of essential vitamins or minerals.
The float is famous for the chemical reaction between the carbonation in the soda and the proteins in the ice cream, which creates a thick, foamy 'head' that rises over the rim of the glass. Culturally, it is a nostalgic symbol of 1950s Americana, representing a simple, indulgent treat often associated with summer and childhood.