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Toyota, Honda and Hyundai have announced that they plan to build hydrogen-powered cars in the next few years. But is America ready for automobiles fueled with gaseous hydrogen? Take a test-drive in one and find out.

Remember screw caps on jugs of wine? These days, many winemakers have wholeheartedly embraced the screw tops — not just for their ease of use, but for the way they seal the wine's taste. Now many consumers are learning to look past the caps' former downmarket reputation.

Egypt's government has been cracking down on the Muslim Brotherhood, the Islamist organization that backed recently deposed president Mohammed Morsi. Last week, the government designated the brotherhood as a terrorist organization. Now, Egypt's top prosecutor has ordered a 15-day detention for several journalists on suspicion of joining the brotherhood, including two producers and a correspondent for Al-Jazeera English, who are accused of "tarnishing Egypt's image abroad." For more on Egypt's beleaguered press freedoms, Audie Cornish talks with Sherif Mansour of the Committee to Protect Journalists, which found Egypt to be one of the top jailers of journalists in its most recent census.

The widening gap between the rich and poor in the U.S. has become a central touch point for economists, pundits and politicians across the U.S. New York City's newly sworn-in mayor, Bill deBlasio, was elected after campaigning against a city divided between the haves and have-nots. President Obama has called tackling inequality the defining challenge of our time, saying that growing inequality and a lack of upward mobility jeopardizes the American dream. But what, exactly, is income inequality? Audie Cornish puts that question to Drew DeSilver, a senior writer for the Pew Research Center's Fact Tank blog.

Researchers in Tokyo have put a new twist on the use of sound to suspend objects in air. They've used ultrasonic standing waves to trap pieces of wood, metal and water – and even move them around.

The New York Times and Britain's The Guardian have published editorials saying accused spy Edward Snowden has sparked an important debate about the proper limits of electronic surveillance.

The proceeds from corruption, and legal and ethical gray areas, are a daily fact of life in China. The practice of gray income, which shows no sign of abating, may make political reforms more difficult.

More than 1 million people lost their unemployment benefits as 2014 began. Whether or not those benefits get extended, economists say there are ways to change the program that will make it work better. One suggestion is work sharing, which has helped reduce Germany's unemployment.

For the past three decades, the state averaged about 50 quakes a year. Last year, there were almost 3,000. Some geologists say the state's oil and gas industry might be to blame for the increase.

The Justice Department will answer a challenge to a provision in the law requiring most employers that offer health insurance to include birth control at no cost. A group of Catholic nuns objects to the provision, and they won a temporary reprieve from Supreme Court Justice Sonia Sotomayor.