North America’s first people may have arrived by sea ice highway as early as 24,000 years ago

One of the hottest debates in archaeology is how and when humans first arrived in North America. Archaeologists have traditionally argued that people walked through an ice-free corridor that briefly opened between ice sheets an estimated 13,000 years ago.

But a growing number of archaeological and genetic finds—including human footprints in New Mexico dated to around 23,000 years…