Science Has a Name for What’s Plaguing the Reflecting Pool | Testing reveals that efforts to suppress one algal bloom seem to be fueling another.

Tourists and locals were converging on the site where Martin Luther King Jr. spoke and where protesters denounced the Vietnam War, just to catch a glimpse of the wayward sealant—or perhaps even a souvenir.

“Taking a piece of paint is like taking a piece of the Berlin Wall,” one cyclist passing by told me. “It’s a piece of history.”