A long-sleeved T-shirt is a type of shirt in the style of a T-shirt, which the original kind is short-sleeved, but with long sleeves. It has been an acceptable piece of fashion since the 1970s. Since the mid-1980s, it has often been worn underneath a short-sleeved T-shirt for a nice-looking, warm combination. That style is typically done in the fall and winter. T-shirts were originally worn as undershirts. This still occurs, but T-shirts are now also frequently worn as the only piece of clothing on the top half of the body (except that women usually wear a bra beneath it).
Dark or Darkness is the perceived absence of light. Contrary to popular belief, pure or total darkness does not exist, because some small amount of light particles, in the form of radiation, permeate every corner of the universe, even if undetectable to the human eye at times. So, darkness is best described as "less amounts of light," rather than "the absence of light." True darkness is only theoretically possible in conditions of absolute zero. Earlier in history, it was sometimes viewed as a substance in its own right, and appears in this form in some fantasy literature.
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