The National Science Center takes science on the road with its Mobile Discovery Centers (MDC). Housed in 18-wheelers, the mobile centers travel across the country, presenting programs designed to show young people that studying science and math is fun as well as essential to their future. The complete 50-minute program presented during van visits consists of hands-on, interactive science demonstrations. Up to six sessions can be scheduled each school day. The MDC is currently offered as a FREE Outreach Program provided by the National Science Center and the U. S. Army.