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Scientists worldwide face a yearly challenge in deciding what goes into the annual flu vaccine to make it effective. The job requires keeping tabs on a massive group of speedy, shape-shifting viruses.

Everyone knows that distrust of Washington is at near-record levels and that Congress has grown more polarized. But what's going on with American voters is more complicated than you may realize.

The pope arrives in the country on Friday. Commentators James Kassaga Arinaitwe and Viviane Rutabingwa give him a crash course in the country's issues.

Brazil's Environment Ministry announced that deforestation in the country has increased by 16 percent. A separate study warned that more than half the Amazon's tree species may be threatened.

The USDA recently stunned growers when it projected the smallest orange harvest for Florida in more than 50 years. The culprit: A tiny insect that's killing off the state's trees — and industry.

A 10 percent bump in pay under the Affordable Care Act will expire at year-end. The bonus was supposed to help balance the reimbursement discrepancies between primary care providers and specialists.

"Will it scale?" is often the first thing we ask about an educational innovation. Two innovators argue that it's the wrong question.

Four of the eight alleged masterminds are on trial for the theft of almost $21 million worth of gems and other valuables. A reporter covering the case details the story's peculiar developments.

Phones are becoming more shopping-friendly and more consumers are willing to wait for online deals. This year's online sales boost signals an era of mobile shopping as retailers race to keep up.

Li-Fi is a lot like Wi-Fi, but it uses light to transmit data. NPR's Scott Simon speaks to the man who invented the faster alternative: Harald Haas.