In Moscow on Saturday, tens of thousands of protesters braved the sub-zero temperatures to gather in the city center. They were demonstrating against Vladimir Putin's planned return to the presidency next month. Guest host David Greene has more.

The UN Security Council failed to pass a draft resolution aimed at pressuring Syria's government to stop its violent crackdown on dissidents on Saturday morning. NPR's Michele Keleman and Kelly McEvers join guest host David Greene to update the vote and the fresh breakout of violence Saturday morning.

Since the early a.m., U.S. Park Police have been moving into a park near the White House where the Occupy D.C. movement has been encamped for months. Some officers are on horseback and dressed in riot gear, but there haven't been any major clashes so far.

If there are, you'll likely see it on this Washington Post live video stream.

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DAVID GREENE, HOST:

Imagine a place on earth where there's been no light, no wind for millions of years. Lake Vostok is one such place. The world's third largest lake, in terms of amount of water, has long been hidden, buried beneath two miles of ice until, perhaps, this coming week. Russian researchers are about to break through that ice.

In an about-face, the Susan G. Komen for the Cure foundation announced Friday that it is not cutting off funding for Planned Parenthood. Komen is one of the nation's most prominent breast cancer groups. They came under intense criticism for their initial decision to cut off some funding for Planned Parenthood. Guest host David Greene talks with NPR's Julie Rovner and Rob Stein, who have been covering the story.

As the primary season pushes westward, voters in big Western states share what they like and want, plus why they feel they're a different kind of electorate.

Though most people will never attend a single Super Bowl, there are three men who have seen them all. Don Crisman and Larry Jacobson are part of a group that calls itself the "Never Missed a Super Bowl Club," and they have no plans to end the streak any time soon. Guest host David Greene catches up with them as they prepare for Sunday's game in Indianapolis.

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DAVID GREENE, HOST:

Well, now on to some slightly warmer waters. Sturgeon have been swimming around for more than 200 million years. But their eggs have long been sought after and for caviar and they've been overfished. This week, the National Marine Fisheries Service placed the Atlantic sturgeon on its Endangered Species List, and the ruling has implications that go far beyond the caviar industry.