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Reporter's Notebook: Back from election coverage in Florida, NPR photographer Becky Lettenberger shares her thoughts.

Spanish scientists have identified the specific gene in yeast that's responsible for the foamy head on your glass beer. And that discovery could lead to what we've all been wishing for — more long-lasting foam on top of our ales of the future.

The Republican nominee's campaign says the Obama administration has sent mixed signals. President Obama's top aides say that's not so. That's likely to again be a point of disagreement during Tuesday's debate.

As Otto Perez Molina takes office Saturday, one of his top priorities is regaining U.S. military aid, which the U.S. banned because of alleged abuses during Guatemala's civil war. Experts say exactly how Perez will tackle the current wave of violence — or if his approach is effective — remains to be seen.

The indictment handed down Monday night by Brazil's top prosecutor makes Temer the first sitting president in the country's history to be charged with a crime. And the legal saga is far from finished.

Twitter has struggled to attract new users. Its latest effort at rejuvenation is a new kind of timeline that predicts which older posts you might not want to miss and displays them on top.

Almost all cable subscribers pay to rent a set-top box netting the industry billions a year. Chairman Tom Wheeler says ending that practice would lead to more innovation in the way we consume TV.

In this week's roundup of top tech conversations and stories: how tech giants are flexing their muscles against government, Twitter's abandoned blocking policy, and how the tech empire is striking back against creeping government surveillance.

The Final Four tournament was a real nail-biter, coming amid controversy over huge salaries and reports of top recruits stolen. Professor Richard Vedder discusses college chess with NPR's Scott Simon.

The Saudis accounted for a quarter of all sales by Germany. It's part of an emerging pattern of weapons purchases by Saudi Arabia and its neighbor United Arab Emirates. Both countries are major customers of the U.S., the world's No. 1 arms seller.