Learn how our brain sends signals through the nervous system, enabling us to move, feel and think, as Dr. Vitreous, P.H.D. lets us take a peak into his dark & scary underground laboratory * Experiment in Vitreous’ lab & get an up-close look at a nerve cell through a telescope * Backbone Bob & Sensory Sam lend a hand in teaching how they work with the brain to keep the nervous system functioning properly. * This CD-Rom is compatible with Windows XP or earlier and Mac OS or earlier (not compatible with Inter-based Macintosh computers)