It seems that there is a 6th sense, although many scientist do not believe it, because it hasn't been proven. Also, there is the problem that we don't know the form of energy nor where the sense exists. What we do know is that some people seem to be more sensitive the the 6th sense signals than are other people. Limits of taste and smell There are only certain chemicals and molecules that we can taste or smell. Also, the amount of the material must be such that we can detect it.
Dogs have more sensitive noses than humans.
Not only can they detect smaller amounts of a substance, they can also smell compounds that we can't. The fact that there are things in the world that we cannot see, hear, smell, feel, or sense in some other manner, affects our perception of the world around us. Many animals sense things much different than us. The use of some devices has helped us increase the range of what we can sense, as well as our perception of the world. These devices give us a different viewpoint.