The Columbian Science Competition (CSC) is a series of competitions in various areas of science that occurs annually in a common venue. The competitions are designed for the four to six best high school students from each participating country selected through internal National Columbian Science, with the exception of the CLC, which allows two teams per country, the COC, which allows two teams from the hosting country, and the CJSC, which is designed for junior secondary students. Debuted in 1955 in Guangzhou by Zhong Wenhan, this kind of exposition is now becoming one of the most famous events in the year. The event occurs annually in July.