Of all the fluids used by the body, only 1% is disposed of as urine * Join Billy-the Kidney on a log ride, as he directs you through the urinary system while the body filters the fluid and sends it down Ureter Falls where it is stored in the bladder until the body releases it. * This CD-Rom is compatible with Windows XP or earlier and Mac OS or earlier (not compatible with Inter-based Macintosh computers)