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It's a mystery how butterflies manage to make their brilliant wing colors, but Yale physicists got a glimpse when they took the question to the lab, breeding dull brown butterflies into purple ones.

A hot, dry summer has meant the water level on the Rhine River, Western Europe's most important waterway, is at a record low, making it too shallow for many ships to pass.

The changes apply to cases of clergy committing violence or sexual assaults against anyone under their authority, as well as minors. The pope also changed rules about child pornography.

The production of opium in Myanmar has flourished since the military's seizure of power as the faltering economy has led more people toward the drug trade, according to a new United Nations report.

Director of National Intelligence Dan Coats is a former member of Congress and remained popular on Capitol Hill. John Ratcliffe, the president's new pick, is a comparative newcomer.

NPR's Ailsa Chang speaks with Rep. Sean Maloney, D-N.Y., and member of the House Intelligence Committee, about the deposition the head of the U.S. Embassy in Ukraine.

So far this year, flu infections are way down in the Southern Hemisphere. Scientists want to know why — and what it means for the Northern Hemisphere as their flu season looms.

Last week, BuzzFeed's Editor-in-Chief Ben Smith defended his organization's decision to publish the Russia dossier. He talks to NPR's Michel Martin about how the move changed BuzzFeed's approach to journalism.

President-elect Trump's major cabinet nominations are in. Now it's up to the Senate to confirm them.

Governor Ralph Northam ordered all Virginians to stay at home as COVID-19 cases passed the 1,000 mark Monday.Northam's executive order makes allowances…