We tend to think of time as an arrow, always moving in one direction at a uniform rate. But physics is challenging our understanding of time's true nature. ...read more
The human-dog relationship precedes the agricultural revolution. Here's what we know about how it began — with wolves — and the evolving complexity of our loving connection to canines. ...read more
The chilly island is famous for its lack of trees. It may have lost much of the foliage about 1,000 years ago thanks to Norse inhabitants. ...read more