Students stand in formation on a field as they form a smiley face in an attempt to break a world record in celebration of the 110th anniversary of their university in Nanjing, Jiangsu province April 27, 2012. A total of 3,110 students from Nanjing Agricultural University broke the Guinness World Record for World Largest Smiley Face on Friday, overtaking the last world record of 2,961 volunteers in Canada on July 2011, local media reported. REUTERS/Sean Yong (CHINA - Tags: EDUCATION SOCIETY TPX IMAGES OF THE DAY)