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The correct answer is A — but under the redesigned entrance exam, there's no penalty for guessing, so no worries if you got it wrong. You can try your hand at a few sample questions from the new test.

Yes and no. They definitely want a miracle to bring clean, cheap power to the powerless — only a lot sooner.

The transformation of Pittsburgh echoes the triumphs and challenges of cities across the country where gentrification is changing neighborhoods after a generation of economic decline.

The 35-room limestone mansion is so decrepit that there have been calls for its demolition. Prime Minister Justin Trudeau refuses to live there. The big question: What to do with the place?

Scientists found a new species of bacteria in the debris around a Japanese recycling plant. With the help of two plastic-digesting enzymes, it can eat plastic and use it as a main food source.

Methane leaks are bad news. We'll fly over a South Texas oilfield with a leak detection crew and witness — with the aid of an infrared camera — how much methane gushes into the atmosphere.

Schools all over the country, not just Michigan, have struggled to eliminate lead from water fountains and cafeterias — some for more than a decade.

Republicans say the NIH should switch funds from Ebola research to fighting Zika virusi, instead, but NIH officials balk. And a company prepares to test genetically engineered mosquitoes in Florida.

The legislation, which calls for big utilities to stop relying on coal by 2030, emerged from a January agreement between the companies and environmental advocates.

What do Allen Iverson, Tuscan wine and income inequality in Boston have in common? They're all on the #NPRreads list this weekend!