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Three states go to the polls Tuesday, starting what will be an eight-week stretch of primaries in the U.S. For a look at the intra-party political landscape, NPR's Charlie Mahtesian has this overview.

Right now, solar panels make electricity. But a team of engineers in California wants to take solar energy one step further. They're trying to create a device that uses sunlight to make a liquid fuel that goes in our gas tanks.

A bill making its way through the Senate would make more online retailers collect sales taxes. The battle over the bill pits online retailers against brick-and-mortar stores — and, in some cases, against other online sellers. Amazon has endorsed the bill, while eBay is the loudest voice against it.

Same-sex marriage got huge headlines at the Supreme Court last month, but in the world of science and medicine, the case being argued on Monday is far more important. The lawsuit deals with a truly 21st century issue that in some cases can pit drugmakers against patients.

As famine plagues Gaza, NPR exclusive reporting looks at the U.S. role in the humanitarian crisis. Many former officials NPR interviewed share a common refrain: Did we do enough to prevent this?

The Affordable Care Act has produced a surge in the number of people signing up for Medicaid. The ACA offers billions of federal dollars to states to expand Medicaid coverage for the poor. But only 25 states have accepted the federal government's offer, and those that haven't could face economic and budget losses.

Target is ousting its CEO, months after a massive data breach and amid some other business issues.

Officially designated as "ghettos," 25 areas with a high percentage of immigrant residents will be abolished. The government's goal is integration. "What they mean is 'go home,'" one immigrant says.

Since Superstorm Sandy, officials in Washington, D.C., have gotten a clear idea of what would happen in a worst-case storm scenario. Key government buildings and tourist sites like the Smithsonian museums are particularly vulnerable to flooding. So federal and local officials are taking steps to protect them.

After a South Carolina couple adopted a baby girl, her biological father sought full custody. Normally, the Supreme Court does not hear such disputes, but this case tests a federal law meant to stop Native American children's being improperly taken from their families.