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What Is a Concept?
The way that scientists have understood what a concept is has really changed over the years. People used to think about a concept as a dictionary definition for a category so there's a set of things which are similar out in the world and um your concept for for that category is a dictionary definition of the features the necessary insufficient features of that of those instances. Scientists discovered observed that actually not all instances of birds have feathers and not all instance of birds fly.