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Rice University history professor Douglas Brinkley, Jason Johnson of The Root, and NPR's Mara Liasson discuss the changing thoughts on how a president should behave.

In the '70s, Dr. Herbert Needleman made a discovery that changed how people think about lead. His work led to a ban on lead in gasoline. But as seen in Flint, Mich., lead poisoning is still a concern.

Why are chefs adopting sea greens in their cuisine? They're tasty and nutritious, and growing them is good for the planet. Maine's budding seaweed business is boosting an endangered coastal economy.

When Ethiopia barred its best distance runner from competing in the 2016 Olympics, many saw it as an act of ethnic discrimination. Another runner from the same ethnic group says he was exiled.

The prime minister of India visits the U.S. this week and will meet with President Obama and address Congress. Modi was once banned from entering the U.S., but opinions in Washington have changed.

Donald Trump has been the presumptive Republican nominee since last month. Hillary Clinton expects to grab that title Tuesday. But that isn't the same thing as officially securing the nomination.

Clinton is all but assured to secure enough delegates to clinch the Democratic nomination Tuesday. But Bernie Sanders is still campaigning.

Mimi Sheraton first praised kale in the 1970s as restaurant critic for The New York Times. Her article might have helped make kale cool today. Now Sheraton says she hates the vegetable.

When you see a bunch of guys playing street basketball you might not just see a game. In his new book Black Gods of the Asphalt author Onaje Woodbine shows how it's also a spiritual experience.

A federal judge says the U.S. Fish and Wildlife Service overstepped its bounds when it allowed some migratory birds to be killed in large numbers across the eastern United States.