… is a contest in which high-school students solve linguistic puzzles. In solving the problems, students learn about the diversity and consistency of language, while exercising logic skills. No prior knowledge of linguistics or second languages is necessary. Professionals in linguistics, computational linguistics and language technologies use dozens of languages to create engaging problems that represent cutting edge issues in their fields. The competition has attracted top students to study and work in those same fields. It is truly an opportunity for young people to experience a taste of natural-language processing in the 21st century.
Problems and solutions from the 2012 competition are available here.
Dragomir Radev contributed a LLOG post about the first NACLO, back in 2007; and NACLO veterans have done well in recent International Linguistics Olympiads. Registration at most sites is open through January 30, 2013.