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.
Blue-green algae, also known as Cyanobacteria, are a group of photosynthetic bacteria that many people refer to as pond scum.. Blue-green algae are most often blue-green in color, but can also be blue, green, reddish-purple, or brown.