Algal blooms have hit the site, between the Lincoln Memorial and the Washington Monument, after a $14.2 million repair project.

With support from Markwayne Mullin and Robert F. Kennedy Jr., the kratom industry is pursuing a potentially lucrative policy. Mr. Mullin owns equity in a company that could benefit.

A new study of bilingual speakers suggests that a single “grammatical engine” in the brain can power multiple languages at once.

The health secretary is trying to restart the work of a panel that advises the government on vaccines, after a judge froze its decisions and prevented it from meeting.

A prolonged drought means the nation’s largest reservoirs are dwindling, and litigation over access to water could lie ahead.