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Plastic particles are found in our organs, blood and even semen. But do they stay in us forever? What damage are they doing? Here are six questions scientists are trying to answer.

Assad's forces detained mothers and children and sent many of the youth to orphanages. Syrians whose children vanished during the war are now seeking information on their fate. NPR investigates.

Far more families are choosing to have fewer — or no — children. Many countries, including the U.S., now face a rapidly aging population that could begin to shrink.

White supremacist tropes and ironic viral jokes illustrate the administration's project of redefining who belongs in the United States.

Well-meaning city dwellers forgo permits and official procedure to rewild urban areas across the country. In downtown LA, artist Doug Rosenberg is trying to push the grassroots movement forward.