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Non-genetically modified farming is not organic. It's a whole lot cheaper and essentially uses conventional farming techniques. But some consumers think they're the same thing.

"It is just good luck," says astronomer Mark Thompson of the BBC's Stargazing Live. "The last time I have seen it this spectacular was probably 20 years ago."

Secret documents provided by Edward Snowden reveal a program shared by the National Security Agency and the UK's surveillance agency. Spencer Ackerman of The Guardian explains "Optic Nerve."

Narcotic painkillers are risky for small kids. But so are some popular pills to treat diabetes, high blood pressure and irregular heartbeats.

"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.

Refugees once fled to Syria. Now, record numbers are fleeing from it. And the exodus is straining the stability of neighbors who are struggling to support both their own citizens and the displaced.

Journalists talk to narrow sets of experts all the time. Spy magazine once ran an issue quoting the same expert in nearly every story, a total of 17 times, as an in-joke about Washington insularity.

In response, Ukraine has put its own forces on alert and warned that a Russian invasion would spark war between the two countries.

Astrophysicist Neil deGrasse Tyson explains why the cosmos shouldn't make you feel small. Critic John Powers remembers Harold Ramis. And if you think you're anonymous online, think again.

A group of knife-wielding assailants attacked a railway station in southern China, killing at least 27 and wounding more than 100.