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Omar Mateen was previously interviewed by the FBI several times over possible ties to terrorism. Authorities say he pledged allegiance to ISIS before attacking a gay nightclub in Orlando, killing 50.

Health care practitioners who band together can earn Medicare bonuses by saving money. Most of the groups decline potentially richer deals that include penalties for excessive spending.

Michel Martin talks with NPR's Mike Oreskes, Huffington Post's Ryan Grim and Christian Broadcasting Network's David Brody about Donald Trump and how he's leading politics to increasingly bypass media as gatekeepers.

A vast archaeological site sits atop one of the world's biggest untapped copper deposits. Afghanistan must decide which resource will be a greater boon.

New technology, new safety measures, and a new relationship with Cuba are what reporter Jesse Sanchez says will be the big stories in baseball this year.

Renewable energy is taking off across the nation, but storing the energy is still a problem that is challenging companies to innovate, with solutions ranging from molten salt to ice.

"We used to refer to our detention as a 'DT' — a 'Donny Trump' — because he got more of them than most other people in the class," said one of Trump's grade school classmates.

Parks are expensive for obvious reasons: Visitor centers need displays, and roads need repairs. But there's also upkeep of the Grand Canyon's sewage operations and of Independence Hall's sprinklers.

Hillary Clinton and Donald Trump won big across the board, but Ted Cruz pulled off a surprise in Oklahoma, and Marco Rubio finally won his first state in Minnesota.

While genetic mutations are nearly ubiquitous in cancer, they may not always be the driving force for disease, some researchers say. They suggest looking at disruptions in cellular metabolism.