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Germany, Italy and France used to be one country? There were people who were born rich and poor in Silla? Why did ancient Egyptians draw side view of humans? Why do we call Handel mother of music when he is a man?   Knowledge textbook that gives a glance over...

What is the second largest country in the world? What age did humans fight against dinosaurs? In what order should we calculate 37+{16÷(9-5)×7-12}÷8? Use this textbook for adults to remind ourselves about social studies, science, mathematics, and Korean!...