A long-lost slab of Earth’s crust may be pulling away the bottom of the oldest part of North America, scientists say ...

The NASA satellite image shows rust-red rock formations in Wyoming—evidence of 220-million-year-old 'megamonsoons'.

Inside the steeple of Old North Church and among the Southern Colonies, less familiar stories of the events from 250 years ...

MICHAEL BECKLEY is Associate Professor of Political Science at Tufts University, a Nonresident Senior Fellow at the American ...