Visitors walk through the Thunderbolt Passage to experience the power of the nature, inside the Meteorologic Popular Science Hall for Public Experience, which opens to mark the World Meteorological Day, in Hangzhou, capital of east China's Zhejiang Province, March 23, 2009. Visitors came here to learn about popular ken of sciences, weather phenomena, catastrophic accidents, and others in close relevance to meteorology, as well as interact with meteorology-related activities.[Xinhua]