Huge ice wall may have blocked off Americas to first migrants

The video explores theories of how early humans migrated to the Americas, challenging the traditional land bridge theory with evidence suggesting a coastal route via boats. It examines the ice-free corridor hypothesis, which posits a passage between ice sheets in North America, but geological evidence indicates this corridor was not open until 13,800 years ago. This contradicts findings of stone artifacts in Mexico dating back 26,500 years, suggesting the corridor was blocked by massive ice sheets, which were taller than any modern building.

What height range did the ice sheets reach during the time of early migration?

What does the new study suggest about the height of the ice sheets compared to buildings on Earth?