Three miles northeast of Greenbelt, the Agricultural Research Service's (ARS) research center in Beltsville has developed everyday innovations such at backyard fly traps, orange juice from concentrate, and seedless grapes. Today BARC's research priorities are climate change, food safety, nutrition and obesity, international food security, and bioenergy. When several offices were attacked by anthrax mailings in 2001, it was scientists at this Beltsville location who helped determine where the anthrax came from. The visitor center is inside a log lodge built in 1937 by the Civilian Conservation Corps, and tours take at least two hours. Because of their length and technical nature, tours are not recommended for children below middle-school age. There are neither free food samples nor cafeterias on-site, but ARS sponsors a farmers' market down the road from the visitor center on Thursdays. Reservations are essential; call at least three weeks in advance. The visitor center, building 302, is located on Powder Mill Road, about a half mile away from the main building on Baltimore Avenue. It may not show up on a GPS, so call ahead for directions.