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They've been offered an app intended to block the abuse and toxicity that can slip past older social media filters.

A drop in the numbers of fierce beasts worldwide might seem like good news for deer and antelope. But expanding herds of grass-eaters leave stream banks naked and vulnerable to erosion, and can even change the stream's course, according to scientists calling for more protection of large predators.

Vladimir Putin presented a united front after an attempted mutiny. President Biden says the U.S. was not involved. Researchers say intermittent fasting could be as effective as calorie counting.

In a short speech, Putin talked about the mutiny and said he was always in charge. Russian authorities have dropped the charges against the mercenary leader and others involved in the brief rebellion.

Rep. George Miller (D-CA), tapped by Nancy Pelosi to head up some of the Democractic Party's most important policy initiatives, looks ahead to what Democrats will try to accomplish now that they have control of Congress.

Two top intelligence officials have testified in Congress about the implications of climate change for U.S. national security. They discussed an assessment that identifies parts of the world where climate change could produce political instability.

On Tuesday, we spoke with the top American general in Iraq, David Petraeus, about the security situation there. Wednesday, we hear from Iraqis. Reporters in Iraq set out to get assessments from a number of Baghdadis.

A cheap dollar may be boosting exports, but it's also putting U.S. companies on sale. Foreign firms are snatching up U.S. based companies at the fastest pace in seven years. When the topic is foreign takeovers of U.S. firms it doesn't take much to prompt concerns about loss of jobs and control. But many observers see these transactions as an absolutely normal and inevitable part of globalization.

Monday is the final day of campaigning before the last Democratic primaries are held Tuesday in Montana and South Dakota. Hillary Clinton and Barack Obama have drawn record numbers of voters. While Obama has the lead in delegates, there are signs that Clinton isn't ready to give up her bid.

Israeli forces struck a humanitarian zone in the Gaza Strip, targeting the chief of the armed wing of Hamas. Dozens of people were reported killed.