A polar vortex dipping down from Siberia will bring a cold front with frigid temperatures to nearly 300 million Americans.

Kunhardtia rhodantha is in the family Rapateaceae, which is a family almost endemic to the Americas. This material relates to a paper that appeared in the 22 Dec. 2017, issue of Science, published ...

North America is the third largest continent in the world. It is located in the Northern Hemisphere. The north of the continent is within the Arctic Circle and the Tropic of Cancer passes through ...

Mexico's president sarcastically said that the U.S. should be called "Mexican America" after Trump's vow to rename the Gulf ...

Around 1750, the British mainland American colonies had ... of white colonists resided in the North, but the majority of black people lived in the South, driving agricultural economies based ...

The Mexican president responded to President-elect Trump's contention that the sea should have a more U.S.-centric ...