In our society, a tanned body is associated with good health. However, medical research constantly warns about the dangers of excessive exposure to the sun. What are the benefits of a tan? In some...

In our society, a tanned body is associated with good health. However, medical research constantly warns about the dangers of excessive exposure to the sun. What are the benefits of a tan?

In some cultures, women must be covered completely, except for their eyes, when they go outside. These women exhibit a high incidence of bone problems. Why?