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Each summer, thousands of security researchers, hacktivists, black hats, white hats and feds descend on Las Vegas for Black Hat and Def Con. A look at the stories and trends we're keeping an eye on.

People are building everything from satellites to desk lamps with the help of the Arduino microchip.

The U.S. Justice Department is coming after states like Texas for their voting laws. Guest host Celeste Headlee speaks with former U.S. Attorney General Alberto Gonzales to hear his thoughts.

Liberal North Carolinians have been holding weekly demonstrations called 'Moral Mondays' to protest Republican legislative actions. Reverend William Barber, organizer of the events and president of the North Carolina NAACP, talks about out what's next, now that legislators are wrapping up their session.

Changes to voting laws have been gaining steam ever since the Supreme Court struck down part of the Voting Rights Act. Guest host Celeste Headlee speaks with Allison Riggs, attorney for the Southern Coalition for Social Justice about what the current fight looks like.

At first the pounds melt off and then, nothing. But diet plateaus are a normal part of the body's adjusting to a lower weight. Weight loss experts say trying a variety of tactics can help move beyond the diet plateau. For most people exercise works best.

The idea of intermittent mini-fasting seems to be gaining traction. The appeal: Dieters only have to restrict calories for two days a week. And research suggests this approach is more effective than trying to cut back on calories 24/7.

The Ivanpah Solar Electric Generating System in California's Mojave Desert will power about 140,000 homes and will be a boon to the state's renewable energy goals. But it was no slam dunk. Now, California is trying to bring conservationists and energy companies together to create a smoother path for future projects.

There's a movement to replace Miami Beach's historic homes with large, glitzy houses, and the cause celebre is a landmark house owned by a plastic surgeon and his wife, who's a cast member of the Real Housewives of Miami. Preservationists worry this means the loss of neighborhoods' character.

From the TED Radio Hour, polar explorer Ben Saunders on what pushes adventurers like him to brink of human endurance. In 2004, Saunders became the third man — and the most recent — to ski solo to the North Pole.

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