Due to construction and functional characteristics above described, with the internal reflux column it is possible to get selective the separation of components of extremely complex mixtures, with similar chemico-physical characteristics, not economically separable otherwise.
Uniform numbers in American football are unusual compared to those in other sports. They are displayed in more locations on the uniform; they are universally worn on both the front and back of the jersey; and in many cases TV numbers are displayed on either the jersey sleeves, the shoulder pad, or occasionally on the helmets.
Another apparent violation of the concept of a uniform is that some players on a team will wear the traditional knee-breeches or knickers while other teammates are wearing the more-recent ankle-length, closely cut trousers. Many clubs do this at both major and minor league level, with no apparent objections.