From left, Cobie Smith, 5, and Tatume Smith, also 5, have their picture taken with 'Dora the Explorer.' The children were participants in Nickelodeon's Worldwide Day of Play celebration at Stennis Space Center (SSC) on Oct. 1. The Worldwide Day of Play is sponsored annually by Nickelodeon television network to encourage children to be physically active. Approximately 150 children participated in the event at SSC.