The earliest human footprint on record in the Americas wasn't found in Canada, the United States or even Mexico; it was found much farther south, in Chile, and it dates to an astonishing 15,600 years ago, a new study finds. The finding sheds light on when humans first reached the Americas, likely by traveling across the Bering Strait land bridge in the midst of the last ice age. This 10.2-inch-long (26 centimeters) print might even be evidence of pre-Clovis people in South America, the group that came before the Clovis, which are known for their distinctive spearheads, the researchers said.