Recently a few seventhgraders from Polk County received a lesson on bio-diesel from Polk County teacher Tawana Weicker. Pictured above is Weicker explaining to these youngsters the chemical process of turning waste vegetable oil into usable bio-diesel for vehicles. Weicker was a volunteer in Polk County 4-H&39;s Science Academy held in early August. The bio-diesel program was one of several classes that examined how we generate and use energy as a country. (photo submitted)