We take photos faster than ever, with research suggesting around 1.8 trillion are snapped worldwide each year—about 5 billion a day. But how many of those are just throwaway selfies or random ...

The Namib desert’s sand can be burningly hot but its air, blowing in off the Atlantic Ocean, is cool. Running generates a wind over the body. We concluded that the heat from the sun and from the ...

In the rugged terrain where Mexico and the United States meet, a border wall is just the latest obstacle fragmenting habitats ...

Two volunteers reply to every letter kids send to Great Smoky Mountains National Park, answering questions about bears, ...