This year, astronomers traced high-energy particles called cosmic rays back to their birthplaces in the debris clouds of supernovae—a feat that Science's editors chose as a runner-up for Breakthrough of the Year

In work that Science's editors named a runner-up for Breakthrough of the Year, researchers studying mice have found experimental evidence that sleep helps to restore and repair the brain

In work that Science ranked as a runner-up for Breakthrough of the Year, researchers used structural biology—the study of the molecules of life—to design the key ingredient of a vaccine against a dangerous childhood disease