4/1/2015 Beside my office is a childcare center. Almost every morning I can see a gaggle of little toddlers playing in the play ground. One day, I saw these group of toddlers lining up in front of the childcare center. They walked hand in hand; some of they were playful and they kept disturbing their friends; some looking around curiously; some wanted to walk by their own and kept trying to dropping out. Their merry voices, laughter and a rising excitement had lightened up the environment.