Scientists have finally replaced the old “one dog year equals seven human years” shortcut with a formula grounded in biology, ...

It's no secret that the United States is home to some stunning national parks, but that doesn't mean that it's easy to visit these delightful public spaces. As these parks have been preserved for ...

The roots of Russia's invasion of Ukraine go back decades and run deep. The current conflict is more than one country fighting to take over another; it is — in the words of one U.S. official — a shift ...