Talk of the Nation

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.

A series of tornadoes struck the central United States this week, including a powerful storm in Oklahoma that killed at least 24 people. Marshall Shepherd, the president of the American Meteorological Society, describes the ingredients of major tornadoes, and how they are predicted.

Last year scientists reported that a skin cancer drug appeared to reverse the effects of an Alzheimer's-like disease in mice. But four studies out this week in Science question the original results. Ronald Petersen, director of the Mayo Clinic's Alzheimer's Disease Research Center, talks about the new findings, and the hunt for Alzheimer's drugs.

Scientists say climate change could increase pests and weeds, lengthen growing seasons and turn dry soil to dust. Farmers are already on the offensive, adopting no-till cropping methods to conserve water and experimenting with different seeds. And scientists are using a technique called gene silencing to develop new crops--without tinkering with the plants' DNA.

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.

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.

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.

The use of slang in court proceedings can be tricky, especially in criminal cases where an uncommon slang term used by a witness can make a difference in a case. New York Times tech reporter Leslie Kaufman and law professor Greg Lastowka talk about how judges and lawyers have turned to sites like Urban Dictionary to help define slang terms and the legal implications of the trend.

As criticism of the Obama administration over a string of scandals grows, conservatives see an opportunity to gain momentum for 2014 races. Host Neal Conan and Political Junkie Ken Rudin talk with political science professor Jack Pitney about the GOP and the re-emergence of the Tea Party. Plus: the week in politics from Anthony Weiner's New York mayoral candidacy to the Senate immigration bill.

You've probably seen it in your inbox before: Someone who claims to have come into a fortune needs your help. You can share in the profits — if you send along a deposit or your bank account number. Boston Globe correspondent Finn Brunton talks about the history of the "Nigerian prince" or "419" scam, which actually got its start long before email.

Two years after the death of Osama bin Laden, the U.S. continues to warn of the threat posed by the terrorist organization he led. As part of our "Looking Ahead" series, Peter Bergen, CNN national security analyst and author of Manhunt: The Ten-Year Search for Bin Laden from 9/11 to Abbottabad, talks about the future of al-Qaida.

Monday's tornado tore through parts of Oklahoma City at 200 miles per hour and killed at least 24 people. Many more are missing orinjured. Guest host Jennifer Ludden talks to KOSU reporter Michael Cross and to meteorologist Paul Douglas about why it's so hard to track tornadoes.

Graduation season is upon us and that means a slew of uplifting commencement speeches trying to motivate young adults to greatness. Science and experience tell us that everyone is motivated differently, so how do speakers, coaches and business managers inspire people?

Apple CEO Timothy Cook made a rare appearance on Capitol Hill on Tuesday, testifying after congressional investigators revealed that Apple avoided billions in taxes. The New York Times' Charles Duhigg and guest host Jennifer Ludden talk about the tax code and the digital economy.