Record-long trail of human footprint fossils hints at Ice Age trek

On a day during the late Ice Age, a young adult or teen carrying a toddler hustled across a muddy flat where mammoths and giant sloths roamed. Now, over 10,000 years later, fossilized footprints reveal that possibly perilous journey. The tracks, found in New Mexico’s White Sands National Park, stretch for nearly 1.5 kilometers across […]