Fresh analysis of ancient human footprints in New Mexico confirms that people walked the continent nearly 23,000 years ago, ...

Ancient seas left an expanse of rolling gypsum dunes known as White Sands in New Mexico, and within this surreal landscape lies evidence that humans have roamed the Americas for at least 20,000 years.

We still don’t know exactly when humans first reached the Americas, although we do know that people were present in New Mexico by around 23,000 years ago. All that remains of these mysterious ancient ...