Never use more than one word space (space bar) after a word or period. This rule holds without exception for all major style guides and typographers: prefer I came. I saw. I conquered. to I came. I saw. I conquered. The habit of double-spacing after periods originates in bygone typewriter habits and monospaced fonts, yet no published material from the time of typewriters and monospaced fonts doubles its spaces after periods. Extra spaces create unbalance in the text and draw unnecessary attention to their emptiness. All writers, even those who use only one space, should run a word search to fix any doubled spaces. As in paragraphing, word spaces should remain consistent throughout your writing.