by 
witchipoo
ANSWERS: 6
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Although the exact mechanism is still unclear, it is widely suspected that this occurs due to odorless molecules called pheromones. Women (and men) secrete pheromones in a manner as common as sweating. In fact, the sweat of many mammals contains pheromone chemicals. The molecules from one woman bounce and jiggle their way airborne and waft to another. Receptors in the nose detect the pheromones and the second woman responds by shortening or lengthening her menstrual period. Gradually, over the course of a few months, the periods of all the women living together synchronize in this way. A study (that determined all this by Martha McClintock and Kathleen Stern) indicates the sweat probably contains two chemicals: one that lengthens menstrual cycles and one that shortens them. The two substances can act together to synchronize the cycles and sometimes to disrupt them. By the way, similar studies show that men's pheromones also affect women's menstrual periods. Women respond to these pheromones by shortening their periods and having them more regularly. http://www.wonderquest.com/pheromone.htm
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same reason their crazy and theirs no need to understand them, just accept, just accept.
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That is a strange phenomenon. I worked with a group of women for a while and the same thing happened there. Great question. +5! I'll be watching for a great answer.
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growing up with four sisters, it was done so i did not go completely nuts
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I had never noticed that - and I work with a lot of women... but dont live with any
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its true ! it happens to me even with my friends :P ,, and we dont live together ! it use to come with my mon and sis ,, but not anymore ,, only with my best friends :P
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