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You read the stories in our #15Girls series and posed some really good questions. (Wish we'd thought of them first.) Here are answers from our correspondents.

The traditional Japanese art of folding paper is now adding grace and ease to the deployment of fragile solar panels, seismometers and other vital instruments in outer space.

Obesity and Type 2 diabetes are becoming more common all over the world. But the tiny Samoan islands now have the highest rates. An epidemiologist blames changes in diet brought on by globalization.

The country's prime minister intends to channel policies and plans to achieve a happier society.

President Obama and Vice President Joe Biden launch the "It's On Us" campaign aimed at preventing attacks on university and college campuses.

For many Norwegian-American families, the most anticipated Christmas treat isn't chocolate or sugar-dusted cookies. It's a simple potato-based pancake, spread with butter and sugar or jam.

Our new series will tell the stories of great teachers, and explore some big questions: What is great teaching? Can it be taught? How do good teachers become great ones?

Three months ago, producer Ross Putman started tracking descriptions of female characters from scripts he read. On Tuesday, he shared them with the world on his Twitter account, "Fem Script Intros."

A clever photography trick allows you to see the invisible: the rising heat from a lighter, the turbulence around airplane wings, the plume of a sneeze ... and even sound waves.

In a study published in Science on Thursday, scientists at the Salk Institute show that mice infected with harmful bacteria can get a boost from helpful bacteria.