by Tom Mansell, Science Editor What do humans like to smell? One would think that smell preference would vary from person to person, given cultural and genetic differences. Some smells, though, seem to smell good to pretty much everyone, cross-culturally. In a paper released recently in PLOS Computational Biology, researchers working in Israel reported experiments with an "eNose," a chemical detection device that approximates the ability of the human nose to sense odor molecules. Human subjects were given aroma samples and asked to rate their "pleasantness". The machine was then trained on this data, enabling it to detect the chemical…