Elzada Clover and Lois Jotter conducted a harrowing 43-day trip down the Colorado River in an effort to map the Grand Canyon's flora.

Donald Trump's suggestion Canada becomes the 51st state has brought into the spotlight international boundaries that have ...

It's 200 years since George Stephenson climbed into the cab of the aptly named Locomotion No. 1 and took 600 passengers on a ...