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.
In very severe cases, liver injury and death can occur. How can areas be treated to control blue green algae? Treatment of water with copper sulfate controls algal bloom when applied at 1/4 to 1/2 pound per 100,000 gallons of water. Do not allow animals to drink water from treated areas for 3 weeks.