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Much of the world follows the Gregorian calendar, named after Pope Gregory XIII, who put the finishing touches on a Roman system that integrated ideas from other cultures.

Using CRISPR to modify certain immune cells could make cancer-fighting immunotherapy more potent for a broader set of patients. Two people who went through the treatment share their stories.

NPR's A Martínez talks to writer Jason Reynolds, who is ending his term as the national ambassador for young people's literature. The Library of Congress appointed him to the post three years ago.

Ukraine's allies said they had agreed to provide the country with multilayered international defense guarantees as part of a proposal to end Russia's nearly 4-year-old invasion of its neighbor.

Delcy Rodríguez was sworn in as interim president, as the Venezuelan government sought to show its people and the world that it is being run independently.