When bright green water appeared in the newly renovated Lincoln Memorial Reflecting Pool, it drew national attention and sparked political finger-pointing. The culprit: cyanobacteria—sometimes called blue-green algae—a type of bacteria that can produce toxins harmful to people, pets and wildlife.

Source: [Phys.org](https://phys.org/news/2026-06-dc-algal-bloom-reveals-threat.html)

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