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Good morning.

Here’s what you need to know:

Shots are fired, and bots swarm in

• Soon after the mass shooting at a high school in Florida last week, Twitter accounts suspected of having links to Russia jumped on the hashtag #Parklandshooting, posting messages about gun control.

The automated accounts follow a pattern: “The bots focus on anything that is divisive for Americans. Almost systematically,” said an executive at a company that tracks online disinformation campaigns.

• The shooting, which killed 17 people, has left educators grappling with the prospect of becoming first responders or, worse, human shields. One teacher said, “If I go through my college transcripts — master’s degree, doctorate courses, all that — I know for sure there are no courses that say: ‘Shooter on Campus 101.’ ”

Listen to ‘The Daily’: An Endless WarFour American soldiers were ambushed by militants in a remote desert in Niger in October. It was all part of a shadowy war going back to the attacks of Sept. 11, 2001.Two U.S. national table tennis champions play each other — at the New York Philharmonic. The unique performance uses sounds from an intense match alongside a full symphony orchestra.CreditCredit…Ainara Tiefenthäler/The New York TimesMarjory Stoneman Douglas in the Everglades in 1987.Credit…Mary Lou Foy/The Miami Herald, via Reuters

Born in Minnesota in 1890, she graduated from Wellesley College and worked for a time as a reporter for her father, the editor of The Miami Herald.

She was later asked to contribute to a book series about U.S. rivers. In researching the Miami River, she became interested in the Everglades and persuaded her publisher to let her write about them instead.

“The Everglades: River of Grass” was published in 1947. An environmental classic, the book changed the way the U.S. viewed its wetlands, as important ecosystems and surge buffers rather than as worthless swamps that are more useful when drained.

Despite Mrs. Douglas’s warning that “There are no other Everglades in the world,” development has continued to encroach.

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