  I discuss recent experimental data on the Cronin effect in deuteron-gold
collisions at the top RHIC energy, in a pseudorapidity range [-2,3]. Two
theoretical approaches are compared and contrasted: the pQCD-based
Glauber-Eikonal model and Colour Glass Condensate models. Neither can describe
the Cronin effect over the whole pseudorapidity interval up to now explored
experimentally, its most mysterious and intriguing part being at negative
rapidity.
