81. Researchers have proved that br

81. Researchers have proved that bright light makes a difference to the brain chemistry, although the exact means by which sufferers are affected is not yet known. (Passage one) 82. Although a natural alternative, such as honey, can be used to sweeten food if this is necessary, we can in fact do without it. (Passage two)83. In all the cases of friendly relationships, two people like one another and enjoy being together, but beyond that, the degree of intimacy between them and the reasons for their shared interest vary enormously. (Passage three)84. What we need, rather, is the recognition that bringing up children involves a partnership of equals. (Passage four) 85. In a family where the roles of men and women are not sharply separated and where many household tasks are shared to a greater or lesser extent, notions of male superiority are hard to maintain. (Passage Four)