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Regal fritillary butterflies have largely disappeared from the East Coast, save for a military base in central Pennsylvania. A few days each summer, hundreds descend for guided tours to see them.

Activists aimed to bring one balloon to the president's backyard; they overshot their fundraising goal and now say they will create more than one replica.

You might expect turtles that live near each other or in similar environments would be genetically similar. But new research shows that magnetic fields actually have more to do with genetic likeness.

Massachusetts bore the brunt of the winter storm. Many coastal communities were flooded by a storm surge and Boston recorded its highest tide in almost a century.

Sunk off Oman, the ship once sailed in the fleet of Vasco da Gama, who found a sea route from Europe to India. Now, researchers say an artifact found on board is a 500-year-old navigation tool.

While the Islamic State group has receded from the headlines out of Syria and Iraq, fighters claiming ISIS affiliation have seized a strategic port in Mozambique.

The heat wave has broken records across the region, but lower temperatures will provide some relief for north coast residents today and smoky conditions…

NPR's Lulu Garcia-Navarro talks with Bill Barnett, the mayor of Naples, Fla., about how his city has prepared for Hurricane Irma.

Hurricane Florence may be weakening as it approaches the coast, but North Carolina is still getting ready for extreme wind and water.

An outside group supporting House Democrats is running a digital ad that uses a strategy the party used in 2006 to challenge Republican control of the House — focusing on personal scandals.