Milkshakes got their name from being served in bars. If the customer enjoyed the milkshake, he shook hands with the bartender. If not, the bartender didn’t get a tip.
Malted milk powder was invented in 1897 by James and William Horlick, but it was Ivar Coulson, a soda jerk for a Walgreen’s drug store, who first added it to milkshakes in 1922. This created the malted milkshake or just plain “malt.”
Steven Poplawski invented the electric blender in 1922 just for milkshakes. Before that, the effort of shaking them up must have required a lot of upper body motion.
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