A British friend of mine consistently uses a double space after each period whenever she types a text, and says she was taught that way, and that is the correct way to type. I was taught typing in high school in Spain, and have never heard of using a double space after a period. In fact, to me it looks funny, like the text is full of holes. Most of the typed text I have encountered here in Britain looks normal to me, i.e. has only one space after each period, so I don't think it can be a cultural thing. So I wonder why my friend was taught like that, and whether there is a right and a wrong way of punctuating after a period or it is just a matter of style? What do you all think?