Almost always when you talk to one of the students who has obtained the best grade in the science entrance exam or who has excelled in high school or university, at some point in the conversation the word ends up appearing kangaroo. Also, when math teachers are asked how they've motivated their students, the response often includes a phrase: "There are tests that are given every year..." It's impossible to separate the educational success of many brilliant Catalan students from the Cangur tests. It's an international math competition that celebrates its thirtieth edition in Catalonia this Thursday, with more than 100,000 students registered. Hundreds of schools, institutes, and even universities collaborate, providing space for "the competition for the greats."