A Guardian investigation into the U.S. overdose slowdown found that national declines masked sharp local disparities. Here's how the reporting team got the story.

Since ancient Greece, researchers have tried to isolate special rational points on curves. Now they have the first ever formula that applies uniformly to all curves ...

More than 60,000 years ago, early humans in southern Africa were carving patterns onto ostrich eggshells—and new research shows these designs were far more sophisticated than previously believed. A ...