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.
A lot of players tend to wear spandex shorts underneath their uniform shorts, and the compression provided from those, combined with the body's nature to divert blood from the area to be used in the muscles (and thus causing it to shrink) tends to keep it out of harm's way.