A group of Bangladeshi youth participates a Flash Mob programmes under the campaign of the world population reaches 7 Billion at the Bashundhara City Shopping Complex in Dhaka city on 29 Oct. The world’ population will reach at 7 billion on October 2011. The United Nations Population Fund (UNFPA) and United Nations Youth and Students Association of Bangladesh (UNYSAB) is innovative global campaign—7 Billion Actions—to build awareness around the opportunities and challenges of a world of seven billion people. © Monirul Alam