Sci4Kids from USDA Agricultural Research Service
Agriculture can be fun for big kids and small kids. The ARS Sci4Kids page, "Bridging the gap between science, agriculture and you." Sci4Kids
"You don't have to live on a farm or even have a garden to do an agricultural science project. You just have to be interested in what goes into growing plants and animals or how this affects the world around you." from: http://www.ars.usda.gov/is/kids/fair/story.htm