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Research into why some people have strong memory well into old age suggests that their brains are different from their peers. Some parts of the brains of "superagers" responsible for attention, thinking and memory seem to be spared the typical age-related shrinkage.

In NPR's Elise Tries series, correspondent Elise Hu tries out different experiences in East Asia. In rapidly aging Japan, an edible innovation is helping seniors enjoy meals without fear of choking.

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.

It quickly became clear that the "news" was not true. There had been no explosions at the White House and President Obama was fine. But a message on the wire service's Twitter account rattled investors.

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.