Revelers pack the Pamplona town square during the launch of the "Chupinazo" rocket, to celebrate the official opening of the 2013 San Fermin fiestas in Pamplona, Spain, July 6, 2013. The United Nations World Population Day is observed on July 11 every year to raise awareness on global population issues since 1989. Huge crowds can be seen all over the world.[Photo/IC]