NPR News

If you're one of the more than 100,000 people in the United States waiting for a kidney transplant, you might not realize that an economist is trying to get that kidney to you faster. And he wants to make sure it's the best possible kidney for you, so you'll have many healthy years ahead.

The economist in question, Alvin Roth, won a Nobel Prize in 2012 for his work in matching markets. Those are markets where price isn't a key factor. You can't buy a good job or a spot in college. And you can't buy a kidney, because that's illegal.

Rupert Murdoch, the 84-year-old Australian-born media baron, says he will step down as head of the global media empire 21st Century Fox, handing the reins to his son James.

A source has confirmed to NPR's David Folkenflik that James Murdoch would become head of the company. The elder Murdoch will become co-executive chairman with another son, Lachlan.

A Virginia teenager pleaded guilty on Thursday of providing material support to the so-called Islamic State.

According to a statement of facts filed in federal court, Ali Shukri Amin took to Twitter to advocate on behalf of ISIS. Amin admitted that he showed the terrorist group how to use Bitcoin, a virtual currency, to mask its funding and he also admitted to helping another Virginia teen, 18-year-old Reza Niknejad, travel to Syria.

After Joyce Carol Oates sent an outraged tweet about the "barbaric" killing of an animal this week, a debate emerged: Was the author, 77, slipping? The question was prompted by the image accompanying Oates' tweet, of a triceratops and a smiling Steven Spielberg.

"So barbaric that this should still be allowed," Oates wrote. "No conservation laws in effect wherever this is?"

It will be up to state officials and Congress to help consumers who can't afford health insurance if the Supreme Court strikes down health law subsidies for millions of Americans, Health and Human Services Secretary Sylvia Burwell.

"The critical decisions will sit with the Congress and states and governors to determine if those subsidies are available," Burwell told the House Ways and Means Committee on Wednesday.