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David Greene talks to materials chemist Donald Sadoway from the TED (Technology, Entertainment and Design) conference in Long Beach, Calif. Sadoway is the co-inventor of the liquid metal battery. It's inexpensive, super efficient, sustainable and can provide large scale energy storage.

More than a dozen candidates are seeking to become Egypt's next president in what looks to be the most competitive election ever. Still, many Egyptians fear those in power will try to manipulate the process.

Federal prosecutors have charged five men with responsibility for some of the biggest computer hacks in the past few years. The FBI says the hackers penetrated the computer systems of businesses like Fox Broadcasting and Sony Pictures, stole confidential information and splashed it all over the Internet.

The United Nations says President Bashar Assad's forces have killed more than 9,000 people during the year-long popular revolt. Now, the plight of Syria's children has captured attention. Host Scott Simon talks with Navi Pillay, the United Nations high commissioner for human rights, who is one of the most prominent voices calling for their protection.

In Denmark, far-right movements from various countries are gathering with the hope of launching a pan-European, anti-Islamist alliance. NPR's Philip Reeves reports.

In a "flash mob," hundreds of people invade a public space to do something in unison. But a "cash mob" adds a mission to that idea. All over the country, crowds of people are being organized on social media sites to invade mom-and-pop stores at a specific day and time to spend money locally.

As the civilian death toll rises in Syria, there are increased calls to provide arms to the Syrian opposition. Turkey is well-placed to take the lead. But Ankara is thus far reluctant to send arms across the border or use its military to create humanitarian safe zones inside Syria.

On Sunday Christians all over the world will observe Easter Sunday with joy. But what is joy? Host Scott Simon talks with Father James Martin, a Jesuit priest, contributing editor to America Magazine and author of Between Heaven and Mirth: Why Joy, Humor and Laughter Are at the Heart of Spiritual Life.

Federal prosecutors argued Monday that Jeffrey Epstein could not have preyed on teenage girls without the help of the British socialite. Defense attorneys, meanwhile, said she was wrongfully accused.

The Asian population in Fort Bend County is Texas' largest. When the Texas Legislature met to redraw congressional maps, many Asian Americans hoped it would reflect that. That didn't happen.