Bulky “nanobubbler” machines were carted off ahead of a promotional event for President Trump’s Ultimate Fighting Championship birthday party.

A new, intensive plan to keep the Reflecting Pool on the National Mall clean is emerging after the Trump administration spent months trying to turn the iconic memorial sparkling blue at the behest of President Donald Trump.

The Lincoln Memorial Reflecting Pool is a popular spot for protests, celebrations, and photos. It's known for its peaceful atmosphere but also for its murkiness and gnat-filled air.

Trying to kill algae with chemicals is a common response when community ponds or other water features go green, but a freshwater ecologist says there may be safer and more effective solutions