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In order to improve the quality of health care and reduce its costs, researchers need to know what works and what doesn't. One powerful way to do that is through a system of "registries," in which doctors and hospitals compile and share their results. But even in this era of big data, remarkably few medical registries exist.

This post was updated at 8:10 a.m. E.T.

American Pharoah, ridden by Victor Espinoza, has won the 141st Kentucky Derby with a time of 2:03:02.

He raced to victory before the largest Derby crowd ever — 170,513, reports The Associated Press.

American Pharoah, owned by Ahmed Zayat, was the favorite heading into the race at Churchill Downs in Louisville. He had to fight Firing Line and Dortmund for the victory; the three were neck-and-neck (and neck) for a stretch, but American Pharoah pulled ahead at the end. Firing Line came in second.

For The Record: The Voices Of Baltimore

May 2, 2015
Copyright 2015 NPR. To see more, visit http://www.npr.org/.

Transcript

ARUN RATH, HOST:

It's ALL THINGS CONSIDERED from NPR West. I'm Arun Rath.

(SOUNDBITE OF BALTIMORE PROTESTS)

NPR's Arun Rath speaks with James Risen of the New York Times about a new report alleging that the American Psychological Association worked closely with the George W. Bush administration to help justify prisoner torture.

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

Transcript

ARUN RATH, HOST:

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

Just a few weeks ago we heard a lot about a delicate compromise that would allow Congress to review any deal emerging from nuclear talks with Iran. It came from a bipartisan negotiation in the Senate Foreign Relations Committee — to wide acclaim.

Updated at 1:50 a.m. EDT Sunday: Mayweather wins

Floyd Mayweather Jr.maintained his unbeaten record with a unanimous decision victory over Manny Pacquaio in their unified welterweight megabout in Las Vegas on Saturday.

The 38-year-old American made a surprisingly strong start, then withstood some aggressive counter-punching by the Filipino southpaw in the later rounds as he improved his career record to 48-0.

At least 30 gravesites have been uncovered in a mountainous area of southern Thailand — many containing remains thought to be migrants from neighboring Myanmar, says Michael Sullivan, reporting from Thailand for NPR.

Authorities in Nepal now say the number of dead from a 7.8-magnitude earthquake that hit the South Asian country a week ago has risen to 6,841, as rescue workers recover more bodies from the wreckage. More than 14,000 are reported injured.

NPR's Russell Lewis, reporting from Kathmandu, says thousands are still missing and some 130,000 homes and buildings have been destroyed and another 10,000 buildings have been demolished, according to the government.

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