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Why Do People Sleep? - by ER Baby

Why Do People Sleep? - by ER Baby

iOS Universal Education

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One evening, Princess Sissy was sewing a beautiful garment for the King as her present for King's birthday. It was already late, Princess Sissy was very sleepy and yawning, why do you yawn when you feel sleepy?

ER children's stories mainly make children-oriented stories commonly related to answer some popular science inquiries. Through the story, the children will learn some natural phenomenon and principles which they usually encounter in their daily lives, also these stories are great help in enlightening the scientific path of children’ exploration.

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Fix some of the problems

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