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Saber teeth — the large fangs of saber-tooth cat fame — are fearsome. They evolved at least five times in predators that are now extinct, but there's been something of a mystery as to why.

Ukrainians are going to the polls to elect a new president. Disillusionment with pervasive corruption and fatigue with a low-level war have not put a damper on Ukraine's lively politics, though.

Ariana Grande was named Artist of the Year, Lil Nas X won Song of the Year and Best New Artist went to Billie Eilish. Missy Elliott received the Michael Jackson Video Vanguard Award.

President Biden has invited Ukrainian President Volodymyr Zelenskyy to the White House on Tuesday as a show of commitment while Congress debates funding for the war.

President Trump's ceremony-laden Japan visit featured a sumo match and an audience with the new emperor. Despite talk of an ironclad alliance, rifts over trade, Iran and North Korea stood out.

Over 100 prisoners were killed — either shot dead or crushed — after they tried to escape from the infamous Makala Prison in the Democratic Republic of Congo capital of Kinshasa.

The news of the leak to a reporter of life-and-death operational details lands differently with veterans and active duty troops, who can be prosecuted for much less significant "spillage" incidents.

Because of a change in the climate, giant sequoias have become more vulnerable to insects, disease and wildfire.

UN officials say it is difficult to estimate just how many civilians have been killed in El Fasher, a city in Sudan's Darfur region that fell to a brutal paramilitary force.

A pair of studies show that American rivers are getting hotter, posing a risk for many fish species.