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.
Exposure to blue-green algae can cause rashes, skin and eye irritation, allergic reactions, gastrointestinal upset, and other effects. At high levels, exposure can result in serious illness or death.
Causes of green algae. Unlike the other algae, green algae isnât necessarily a sign of poor tank conditions. It can be unsightly, however. The cause of huge blooms is phosphate and nitrate in excess of what can be taken up by the tank plants, perhaps because of excess feeding, fertilisation or crowding of the aquarium.