On 22nd May, the International Biodiversity Day of 2013, initiated by UNEP-Tongji IESD, Tongji Dance Club and Chorus Club held the third-round of street dancing and singing flash mob at the Cherry Avenue and the play ground of International School of Tongji Siping Campus. This flash mob consisted of several groups of dancing, ranging from Chinese traditional dance to jazz and hiphop, and a small chorus singing the song of Heal the World.