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Says one activist: "They tell us, 'Because of you, we are breathing free air.' "

With a single move, Rikers Island prison has taken the lead on prison reform on one issue: It banned the use of solitary confinement for inmates under 21 years old.

Birders especially know that Cuba harbors hundreds of rarely seen, little-studied species. As the island nation opens to more U.S. visitors, scientists hope "green Cuba" can survive increased tourism.

Drug lords face a recurring problem: what to do with all that cash? Time and again, they have managed to launder their fortunes through some of the world's leading banks.

"Any violation of Ukraine's sovereignty and territorial integrity would be deeply destabilizing," President Obama said, urging Russia not to intervene and calling for an end to the recent violence.

As video games become more mainstream, some social action organizations are using them to raise awareness or raise funds. They advocate for a range of causes, from the struggles of women in the developing world to the effects of power in Congress.

President Obama is hosting a high-profile group of technology executives at the White House on Tuesday. Almost every one was a big financial backer of the president's political career. Chad Dickerson, chief executive of Etsy, is among the group but only gave $500 to the Obama campaign.

The Sunday morning derailment killed four people and injured at least 60. Investigators say the train was moving at 82 mph when it entered a curve where the speed limit was 30 mph. The throttle was cut and brakes were applied "very late in the game," an NTSB official says.

That's the view of Michael Elliott, head of Bono's anti-poverty group One and a delegate to Davos, where leaders and activists are gathering this week to hash out solutions to the world's ills.

As part of a series on hashtag activism in 2014, Audie Cornish speaks with Obiageli Ezekwesili of the Open Society Foundation. Ezekwesili was one of the early promoters of the hashtag #bringbackourgirls, about schoolgirls kidnapped in Nigeria in April.