Throughout human history, our ancestors left behind countless puzzles that continue to baffle scientists, archaeologists, and historians today. From impossibly precise stonework that predates known ...

Scratches that researchers believe a swimming reptile left on a muddy lake bottom have survived in stone in Bucks County, ...

A group of sea animals that first appeared more than 500 million years ago may share a wormlike ancestor with two other ...

A farmer’s shovel hits stone. A shepherd chases a lost goat into the wrong cave. History rarely announces itself. Yet some of the biggest rewrites on record started with exactly this kind of accident.