Were humans in North America during the last ice age?

Human footprints found in current-day New Mexico may be between 23,000 and 21,000 years old.via Science NewsOver 60 “ghost tracks” — so-called because they pop up and disappear across the landscape — show that people romped through what’s now New Mexico 23,000 to 21,000 years ago, geoscientist Matthew Bennett and...