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Describe Piaget's Stages of Cognitive Development:
Sensorimotor: Birth - 2yrs, explore the world through senses and motor skills.
Preoperational: develop object permanence, can mentally represent and refer to objects, pretend play. Egocentric.
Concrete operational: Develop conservation, Can think logically, reverse their thinking, able to think concretely
Formal Operations: Able to think abstractly, hypothetically, use analogies.