
Why is the sky blue during the day and black at night
When children are growing up, especially between the ages of 2 and 9, they are like "a hundred thousand whys" with endless questions. Why is the sky blue during the day and dark at night? Is the earth the only place where people live? Are there people in the stars and moon? Where is the virus? Why can't I see it? My cousin, since childhood is a child full of curiosity about the model. Every time...