Talk of the Nation from NPR

In parts of the southeastern US, aggressive fire ants have been driven out by an even more recent arrival, the tawny crazy ant. Edward LeBrun, a researcher at the University of Texas at Austin, describes the newcomers and how one invasive species can out-invade another.

North Carolina State University biologist Rob Dunn and colleagues surveyed people's pillow cases, refrigerators, toilet seats, TV screens and other household spots, to learn about the microbes that dwell in our homes. Among the findings, reported in the journal PLoS One, homes with dogs had more diverse bacterial communities, and higher numbers of "dog-associated" bacteria.

Smartphones, tablets and computers could help seniors stay connected to their communities and families. But a hefty price tag, steep learning curves, and designs meant for younger eyes and hands could keep some older adults from logging on. Guests discuss the best ways for seniors to tackle new technology, and how devices can be adapted to accommodate older users.

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FLORA LICHTMAN, HOST:

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FLORA LICHTMAN, HOST:

This is SCIENCE FRIDAY. I'm Flora Lichtman, filling in for Ira Flatow today. Last year, researchers reported a breakthrough in treating Alzheimer's disease. They'd found a drug that appeared to reverse the symptoms of Alzheimer's in mice. The drug was already on the market, approved by the FDA to treat a type of skin cancer, meaning Alzheimer's patients could ask their doctors for a prescription, and some did.

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FLORA LICHTMAN, HOST:

This is SCIENCE FRIDAY. I'm Flora Lichtman. You've likely heard of the legendary explorers Lewis and Clark, but maybe not of the U.S. Army explorer Stephen Harriman Long, an engineer who led a scientific expedition through the Great Plaines 15 years after Lewis and Clark.

His expedition traveled through Oklahoma, Kansas and Nebraska. And what did his crew make of America's Breadbasket? A place wholly unfit for cultivation or agriculture, they said. On a map, the explorers labeled the Great Plains as the Great American Desert.

Writings from childhood — cards, stories and other notes — can hide for decades, like time capsules tucked away in boxes, old bedrooms, attics and journals. Writer Jim Sollisch talks about how old thank you notes from his youth foreshadowed his adult life.

Beijing continues to pressure its neighbors over strings of disputed areas in the South China Sea that reportedly hold massive deposits of oil and gas. The ongoing disputes raise serious questions about China's goals in the region and how the United States should address escalating tensions.

In a speech at the National Defense University, President Barack Obama addresses the use of U.S. drones to target terrorists — including U.S. citizens — and his renewed efforts to close the military prison at Guantanamo Bay.

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NEAL CONAN, HOST:

This is TALK OF THE NATION. I'm Neal Conan.