In his theory of Cognitive development, Jean Piaget proposed that humans progress through four developmental stages: the sensorimotor, preoperational, concrete operational and formal operational period.
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Answer: It's celebrated annually on March 8 utilizing the colors purple, green and white and is also a day to focus on calls for gender equality and parity. 1908: 15,000 women marched through New York City demanding better pay, shorter hours and voting rights.
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