From Mexico to the mountains, Arizona’s hummingbirds are on the move. Here's when and how to spot them in Arizona.

If you need a break from city life, the U.S. is full of small, quaint towns brimming with fun activities, and we found the best mountain towns worth visiting.

At the uppermost reaches of stream networks, headwaters dry up during the summer, then burst back into existence when spring ...

Indian Institute of Technology Gandhinagar-led research suggests climate change, increased monsoon rainfall and expanded groundwater pumping have driven substantial vegetation growth in the Thar ...

A season on the Northern Forest Canoe Trail—stretching from the Adirondacks to northern Maine—reveals fresh possibilities for an ancient route.

U.S. to Freeze $2.2 Billion for Harvard After It Defies Trump A Showdown Between the White House and the Nation’s Wealthiest University The move came after the school said it would not submit to ...