This is your first of three free stories this month. Become a free or sustaining member to read unlimited articles, webinars and ebooks. This map depicts all of the subway systems in North America as ...

A NASA map shows the size of the Antarctic ozone hole at its largest point this year, when it spread to the size of North America. The ozone layer protects life on Earth from the sun's ultraviolet ...

More of North America’s land is covered by rivers than we thought, according to a new map.

North America is a road-trip lover’s paradise, with roads criss-crossing some truly magnificent natural landscapes. Here are ...

A map showing the areas affected by the solar flare, including the entirety of North America. Inset, an image of the solar flare. NOAA/SWPC/NASA Solar flares can affect us on Earth, and radiation ...

Imagine a world very different from our own, where North America developed not into the stable geopolitical regions we know today, but Balkanized into smaller empires, territories and republics ...

The world maps that have hung on school walls in Boston and around the country portray North America as larger than Africa (but it’s not) and Alaska as more mammoth than Mexico (also untrue).

According to the NOAA, 24 states, including Alaska, Montana and North Dakota, might have a chance to see the northern lights June 1 and June 2.

Wildfire smoke tracker shows where the air quality is at dangerous levels and where fires are burning in North America.

Nine Nations of North America, 30 Years Later Joel Garreau is the Lincoln Professor of Law, Culture and Values at Arizona State University and a Future Tense fellow of the New America Foundation.

America In 1507, Martin Waldesmüller became the first cartographer to draw a map in which America was a free-floating entity—truly a new continent.