You may have noticed brown, smelly mounds of seaweed covering beaches in South Florida and the Caribbean. It's called sargassum , and it's threatening the tourism industry, sea turtle populations and local fisheries. The weeds even produce a toxic gas that can be harmful to people. Florida Atlantic University professor Brian Lapointe joined Sundial to discuss why the bloom could be among the worst ever seen globally. Sundial host Luis Hernandez also talked with a noted expert on communal therapy