If the Copyright Office has no confirmation that a composer or song-writer is still living and it has been 75 years since the first copyright protection order was granted, or 100 years since the recognized creation date of the piece, it becomes public domain.
What are the symptoms of exposure to blue-green algae? Symptoms from drinking water that contain blue-green algae can include: headaches, nausea, fever, sore throat, dizziness, stomach cramps, diarrhea, abdominal pain, vomiting, muscle aches, mouth ulcers, and blistering of the lips.
A chlorine allergy can be onset after exposure to high levels of chlorine or if you spend a lot of time in swimming pools either recreationally or through sports. The symptoms of a suspected allergy can range from mild skin irritation to a more severe reaction such as a painful and itchy rash or blistering of the skin. After swimming in a chlorinated pool some swimmers experience these symptoms that can be blamed on high levels of chlorine in the pool water. Pool owners that spend a lot of time in heavily chlorinated pools are most susceptible to these symptoms.