The goal of scientific work, is often not to confirm whether some effect exists - its often obvious it is, but to quantify the strength of the effect. They hav

The goal of scientific work, is often not to confirm whether some effect exists - its often obvious it is, but to quantify the strength of the effect. They have done exactly this in this in the study, in fact, along a number of dimensions. Though I won't comment on the validity of their statistics.