Welcome to Washington Secrets and another week in the swamp. We spent part of the weekend with the crowds at the Lincoln Memorial, checking out the algae in the Reflecting Pool. As luck would have it, the nation’s top experts on cleaning up water supplies are in town. Plus, we wonder why it was Donald Trump who announced the resignation of the British prime minister…

Ashley Bair stood still amid the crowd circling the Lincoln Memorial Reflecting Pool on Sunday afternoon, her head tilted down. It just so happens she is an expert on algae and is in town for a conference.