Like how a mechanic might listen to an engine for the sound of something wrong, or how a chef tastes the edge of a ladle to determine the composition of a recipe, smell can also serve as an indicator of useful information. Currently smells are mainly valued for their sensory experience (fragrances, perfume, and cologne). Also there is little scientific knowledge of how our bodies are able to interpret smell. The sense of smell is interesting because the stimulus must be inhaled, the chemical odors must enter our body to be sensed. Smelling feces means that some part of that matter is vaporizing and entering the body’s nasal passage, this can be quite an alarming thought. Another property of smell is the ability to bypass normal sensory filters. While all the information from other bodily senses is channeled through the thalamus of the human central nervous system, the olfactory bulb does not get filtered by the thalamus and travels directly into the mid brain areas. Olfaction can also be strongly associated with memories.