The following section looks at each of these routes into the public domain more closely. Copyright has expired for all works published in the United States before 1923. In other words, if the work was published in the U.S. before January 1, 1923, you are free to use it in the U.S. without permission.
Allergies. An allergy is a broad category describing any time your immune system reacts differently than a normal personâs immune system would react when exposed to something. Symptoms can range from undetectable to extreme and constant, depending on the specifics of the allergy. Weather can play a huge role in allergies and their symptoms during all four seasons of the year. Some people are triggered by rain, others by dry weather. Heat triggers some and cold triggers others. Each of the four season changes can bring new changes in allergy symptoms:
Pollen allergy symptoms: What to look for. Learn how to identify symptoms and find relief for pollen allergies. A surefire sign of spring, blooming grasses and trees can spell doom for people suffering from pollen allergies. Roughly 40 million Americans suffer from pollen allergies, also known as hay fever, allergic rhinitis or seasonal allergies. But whatever term you use, pollen allergy symptoms in adults can range from annoying to life-threatening. The aggressors in this case are nearly invisible, egg-shaped cells that originate in flowering plants and are carried through the environment by insects or wind currents.