A tiger walks the same worn groove along the edge of its exhibit, like a broken record. A parrot methodically plucks out its own feathers until bare skin shows through. To a casual visitor, these can ...

Astrobiology, the study of the origins of life on Earth and the search for life elsewhere in the universe (for example, by analyzing chemical signatures of far-away planets), and the Search for ...

Leigh Robinson was out for a lunchtime walk one brisk day during the spring of 2013 when a call came from the principal at her school. Will, a third-grader with a history of acting up in class, was ...