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The sexes are different because their brains are different. (Moir, 1991) In the past ten years, there have been many researches concerning what makes the sexes different. Remarkably, these doctors, scientists, psychologists, and sociologists are not working together but still have arrived at a very similar conclusion. Until a few years ago, the difference between the sexes has always been attributed to social conditioning. This is the expectations of parents whose own attitudes reflect the expectations of society. Very little attention was given to the biological view that a person may be what he or she is because of the way he or she was made or what kind of hormone he or she may possess. Hormones make people behave in specific stereotypical ways. They may provide the partial answer in the difference of the sexes but the answer lies in a more important part of our body – the brain. The brain is one of the most vital organs of our body. It weighs three pounds and is made up of neutral tissue. The brain is divided into two parts or sides and is also known as the hemispheres. The brain consists of the left hemisphere and the right hemisphere. These two hemispheres are joined by a bundle of nerves called the corpus callosum.