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Object Permanence
The realization that objects continue to exist, even when they can no longer be perceived.
Piaget
Swiss psychologist Jean Piaget, known for his theory of cognitive development that describes how children construct a mental model of the world.
Conservation
The concept that a given quantity of matter remains the same despite being rearranged or changed in appearance, as long as nothing is added or taken away.
Higher IQ's
Refers to above-average scores on standardized tests designed to measure intelligence and cognitive abilities.
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