  Canul-Chay et al. [1] have conducted the segregation experiment of binary
granular mixtures in a bed and subjected the bed to vibration. They report that
the reverse Brazil-Nut phenomenon (RBNP) was never observed in their
experiments and thus conclude that such does not exist. However, we have
clearly demonstrated in [2] by Molecular Dynamics simulations that the reverse
Brazil-Nut problem not only exists, but can be determined from the solid-liquid
phase boundary by a scaling theory for the crossover from RBNP. Hence, instead
of disputing Canul-Chay et al.'s sound experimental results [1], in this reply
we want to draw the reader's attention to the experimental set up and the
interpretation of the experimental results.
