Dr. Hector Ocaranza knew El Paso would see measles the moment it began spreading in West Texas and eastern New Mexico.

Scientists have unlocked the mysteries behind nine rivers and lakes in North and South America that seem to ... Straddling the border between the Canadian provinces of British Columbia and ...

In the north ... U.S. border. And it is already disorienting the region. In recent years, millions of migrants from Latin America, the Caribbean, Asia, and Africa have carved a path from South ...