The molecule and the tetraquark model are the two competing interpretations
of the X(3872). I will briefly comment on how far these two pictures are really
resolvable by the experiment, and I will give a concise account on a new method
for defining the quark content of hadrons at heavy-ion colliders.Comment: 6 pages, to appear in the Proceedings of IFAE2006, Pavia, Ital
