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By playing with the physics of wing color, scientists get a glimpse into how butterflies get their colors, and how quickly they can evolve from brown to brilliant.

Fighting has intensified near two major cities held by pro-Russian separatists in eastern Ukraine. In Berlin, a meeting on a cease-fire ended without any breakthrough.

The state produces a lot of energy, but environmentalists and the oil industry are joining to combat wind power companies as they try to expand.

The death of Brazil's Socialist Party presidential candidate created an opportunity for his running mate, Marina Silva. Her entry into the race has upended the situation. Whereas the man she replaced was running a distant third in polls, support for Silva has surged.

NPR TV critic Eric Deggans says Monday's Emmy Awards promised to recognize TV's emerging future — but ultimately rewarded comfortable favorites over disruptive upstarts.

Lithuania has called an emergency meeting of the UN Security Council to discuss Russia's new incursions into Ukraine. The issue's also likely to dominate an upcoming NATO summit. Since sanctions seem to have failed to change Russia's calculations, the U.S. and its European partners are still trying to find a way to effectively protect Ukraine's sovereignty.

Dr. Kent Brantly and missionary Nancy Writebol have gone through "a rigorous course of treatment and thorough testing," Emory University Hospital's Dr. Bruce Ribner says.

The archbishop of Canterbury says he is embarrassed by revelations that the Church of England indirectly invested in a payday loan firm that he had pledged to put out of business.

Last week, Univision cancelled Eddie "Piolín" Sotelo's popular radio show, Piolín Por La Mañana.Now allegations of workplace sexual harassment have surfaced.

McDonald's may seem to be everywhere, but there are still 105 countries without the fast food giant, from Ghana to Jamaica to Yemen to Tajikistan. In six countries, McDonald's once had a presence, but due to economics, and sometimes politics, the franchises closed.