What could make you walk miles across a landscape full of Ice Age predators, all alone except for the toddler you’re carrying? Archaeologists recently discovered a long trail of footprints left behind by someone brave enough—or desperate enough—to undertake the journey. Sometime between 10,000 and 15,000 years ago, a rather small person, probably a young teen or a short adult woman, walked quickly across the Pleistocene landscape.