How long has the earth been around? Here's a site that gives you a 'sense' of how much time has passed. If you need some new wallpaper for your computer room print this out. If you need a simple science project, print this site and lay it out across the floor for a sense of scale. I presented this to phsylink for validity and though the timeline is accurate the authors notations are disputed. Still a good sense of the time Earth has been around. Remember, These are 'ONE MILLION YEAR' increments.