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Scientists drilling beneath the Gulf of Mexico have hit the layer deposited when an asteroid the size of Staten Island, N.Y., hit Earth. Samples might contain details from that fateful day.

Ten years ago, there wasn't much doctors could do to keep people with age-related macular degeneration from going blind. A colon cancer drug changed all that. But not everyone's vision has been saved.

Arizona Sen. John McCain has spent 30 years in the Senate but he's worried that sharing a ballot with Donald Trump this November could cost him his Senate seat.

A massive wildfire in Alberta now extends more than 600 square miles, and officials are concerned that it could double in size on Saturday because of windy, dry weather conditions.

The Central Asian nation looks increasingly shaky with an autocratic ruler, an Islamist insurgency, a sputtering economy and unstable neighbors.

Playoffs are underway in the NBA and NHL, so Mike Pesca, host of Slate's podcast The Gist, takes this opportunity to debate the merits of the leagues with NPR's Melissa Block.

The Ringling Brothers and Barnum and Bailey Circus no longer uses elephants in its shows. The animals are heading for retirement in Florida. But their work isn't done yet.

Fires continue to rage in Alberta, Canada, threatening neighboring provinces. NPR's Melissa Block speaks with CBC reporter Evan Dyer about the continuing crisis.

NPR's Alice Fordham in Beirut updates Melissa Block about the status of the ceasefire in Aleppo, the al-Qaida affiliate in Syria, which isn't included in the ceasefire, and riots at a jail in Hama.

A fuel tanker collided head-on with two buses. It happened between Kabul and Kandahar, on a road where drivers are known to speed to avoid militant checkpoints.