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NPR's Cokie Roberts previews Hillary Clinton's speech on the economy and Scott Walker's official announcement that he's running for president.

The Justice Department is challenging North Carolina's 2013 elections law, a sweeping overhaul that could affect black voter turnout disproportionately.

The current vaccine loses its protective value as people get older. A vaccine in the works maintains its strength over time. The biggest challenge may be getting adults to use it.

Using lenses and meta-materials, science is finding new ways to bend or reroute light. Like Harry Potter's cloak or H.G. Wells' chemical concoction, it could make an object impossible to see.

In the past, the White House's once-a-decade summit on aging was a multi-day event attended by thousands, but this time there was no funding. So it's a one-day event for a couple of hundred guests.

A Scottish girl's natural pallor nearly kept her family from an overseas trip when airline workers declared her too sickly-looking to fly.

After marathon negotiating sessions, there were reports on Monday that an announcement on a deal was imminent. Of course, any deal would still have to be approved by various capitals.

Democratic presidential candidate Hillary Clinton rolls out her economic policy agenda and says she is focused on growing the wages of the middle class.

It'll take trillions of dollars — not billions, but trillions. Leaders are meeting in Ethiopia this week to figure out how to raise the money. Spoiler alert: Most of it won't come from governments.

Greece, buried under debt, is begging for its third bailout. Europeans are willing to help, but only if Greece can prove that this time will be different. Investors are betting this time, it will be.