Background Graph Mining Networks/Graphs--exist everywhere. Food Web of Smallmouth Bass Leech Little Rock Lake (Cannibal) 1st Tropic Level Mosty Phytoplankton 2nd Trophic Level Many Zooplankton Internet Food Web The Social Stcture of Coutryside"Schod District T和出Ody2 Friendship Network Co-author networksInternet Food Web Friendship Network Co-author networks Networks/Graphs -- exist everywhere. Background Graph Mining