SA Special Editions

In the far reaches of the solar system, a hidden planet larger than Earth may be lurking

The Milky Way turns out to be part of a massive supercluster of galaxies that forms one of the largest known structures in the universe. This discovery is only the beginning of a new effort to map the cosmos

Efforts to explain a strange cold spot in the cosmos have led to the discovery of something even odder: a vast area with very little matter

A daring set of experiments finally confirms Einstein's 1916 prediction of gravitational waves

Scientists are discovering how the brain navigates

Enhancing the body’s own immune system is leading to promising results in the battle against malignancy

Targeting cancer cells using their own DNA could help eliminate tumors and prevent recurrences

This spring our reporter went into the lab to see how scientists are gathering clues to Zika's sudden spread around the world

Drugs we already use for some medical conditions show surprising abilities to keep aging cells healthy. Scientists have new hope that they can develop medicines able to slow aging

Scientists are on the threshold of crossing a sharp ethical line: permanently altering the human genetic code

Synthetic biologists are close to putting living cells to work diagnosing human diseases and repairing environmental damage

They are coming, but not the way you may have been led to think

Listen in as physicists and philosophers debate whether we are real or virtual

An astonishing trove of fossils has scientists, and the media, in a tizzy over our origins

Farmers who have escaped the embattled nation explain how drought and government abuse have driven social violence

Humans are profoundly altering the earth. Is our impact enough to matter across geologic time? Some say it is. Welcome to the Anthropocene