Olympiad Olympiads for the summer and winter games, and such usage particularly for the Winter Olympics is not consistent with the numbering discussed above. The U.S. Olympic Committee often uses the term "quadrennium", which it claims refers to the same four-year period. However, it indicates these quadrennia in calendar years, starting with the first year after the Summer Olympics and ending with the year the next Olympics are held. This would suggest a more precise period of four years, but the 2001–2004 Quadrennium would then not be exactly the same period as the XXVIIth Olympiad. A "Cultural Olympiad" is a concept
Chinese Chemistry Olympiad Chinese Chemistry Olympiad Chinese Chemistry Olympiad () is an annual academic competition held by Chinese Chemical Society. CAS changed its official Chinese name in February 2014, though its English translation remains the same. The first CChO was held in 1984, 16 years after IChO. The event has been held every year since then. China has selected excellent high school students to take part in IChO through the competition since 1987. It is considered to be the most difficult Chemistry exam throughout the world, the difficulty of Final round is much harder than IChO. The difficulty of the preliminary round is