Keep a lookout for this rig. It may pass you on the Interstate this year as it winds its way through 50 locations across the country and Canada. It's in Minnesota at the moment -- all week, in fact -- as we observe Mayo's 150th year. Designed to tell the Mayo story of patient care, research and education to new audiences, it made its debut in Arizona and made stops in Wisconsin before crossing the Mississippi. Following a media tour today, the exhibit will be open to the public in Rochester tomorrow.