My boy's 2nd grade class had a field trip to the Atlanta Food Bank's Tapestry WIC Garden - led by the magnificent Fred Conrad (father to Ivie). The task given to Grade 2...digging up sweet potatoes. Let me tell you...these weren't your ordinary, buy at Publix, bake in the oven, add a little brown sugar sweet potatoes...these things were MONSTERS! I've never seen anything like this! I asked Fred why they were so big and he looked at me and said "Luck!"