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Some posters here seem to be clinging to the long discredited idea that is no difference between men and women. In fact, there are vast biological differences. There are hormonal differences that affect brain development, and result in different behavioral and cognitive differences. Source: Scientific American May 2002:
http://www.sciam.com/article.cfm?articleID=00018E9D-879D-1D06-8E49809EC588EEDF