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Chu Xun has liked to ask some weird questions since he was a child: "Grandpa, why are there day and night?" "Grandpa, where does the light come from?" "Grandpa, why is there light?" "Grandpa, how big is the land?" "Grandpa, how old were you that day?" "Grandpa, why does it rain?" "Grandpa, I finally saw the snow. Why is the snow like this?" "Grandpa, how long can a person live? Where is the dog? Where is the pig? Where is the chicken? Where is the rabbit? Where is the snake? Where is the turtle?" "Grandpa, why do different animals live different times?"