Merrit Kennedy

As thousands of migrants wait to cross the border from Greece into Macedonia, the U.N. warns that Europe is "on the cusp of a largely self-induced humanitarian crisis."

Macedonian authorities closed the Idomeni border crossing Monday, sparking clashes with the frustrated migrants who want to continue their journey north. Guards fired tear gas and rubber bullets at the crowd, the BBC reports.

Syria's cessation of hostilities is largely holding on its third day, even as the main opposition umbrella group accuses the Syrian regime of violations.

Riad Hijab, the opposition's general coordinator, wrote a letter to the U.N. Secretary-General detailing the alleged breaches of the truce, which was brokered by the U.S. and Russia. The letter reads, in part:

Final results are beginning to trickle in from Iran's parliamentary elections, and these returns show major gains for the country's moderate camp.

It's a stunning blow to Iran's hardliners in the first election since last year's historic nuclear deal with world powers.

NPR's Peter Kenyon says reformist parliamentary candidates swept the seats in Iran's capital, Tehran. "All hardline incumbents in the capital lost their seats," Peter reports, though he says conservatives fared better in other provinces.

The Cleveland Clinic says it has performed the first uterus transplant in the United States.

This opens up another possible path to parenthood besides surrogacy or adoption for U.S. women who do not have a uterus, or who have a uterus that does not function.

A "cessation of hostilities" has come into effect in Syria at midnight local time (5 p.m. EST).

The temporary pause in fighting was brokered by the U.S. and Russia, and is meant to be a confidence-building measure to jump-start peace talks between the warring parties. It includes the Syrian government and the main opposition bloc.

A major global assessment of pollinators is raising concerns about the future of the planet's food supply.

A U.N.-sponsored report drawing on about 3,000 scientific papers concludes that about 40 percent of invertebrate pollinator species (such as bees and butterflies) are facing extinction. Vertebrate pollinators (such as bats and birds) are somewhat better off by comparison — 16 percent are threatened with extinction, "with a trend towards more extinctions," the researchers say.

Death Valley, Calif., one of the hottest places in the world, is in bloom with more than 20 species of colorful desert wildflowers.

Texas' top appeals court has dismissed the remaining felony abuse-of-power charge against former Texas Gov. Rick Perry.

The Court of Criminal Appeals also upheld a lower court's ruling dismissing the other charge against Perry.

This all started when a grand jury indicted Perry in August 2014, as Perry was ramping up his campaign for the 2016 GOP presidential nomination. His bid came to an end in September 2015. Perry was the first in the crowded Republican field to suspend his campaign.

Nike co-founder and Chairman Philip Knight has pledged $400 million to Stanford University for a new scholarship program aimed at tackling major global challenges.

A western lowland gorilla at the Bristol Zoo Gardens successfully gave birth by a risky and rare emergency cesarean section.

The U.K. zoo released a video of the new baby, who is now 11 days old and weighs just over 2.2 pounds.

A warning: The beginning of the video shows a few seconds of the operation. You can skip to 0:20 for footage of the cute gorilla.

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