I thought this was pretty interesting:
The average woman clocks up 20,000 spoken words every day, against the paltry male score of 7,000; she speaks more quickly than he does, devotes more of her brainpower to doing so and actually gets a buzz from the sound of her own voice.
According to one American researcher, Dr Louann Brizendine, the reason for our garrulousness can be found in scientific study. The male hormone testosterone, she says, shrinks the area of the brain responsible for communication, leaving women with relatively more cells available for it.