Archaeology Mystery Solved: Strange Footprints From Laetoli, Tanzania, Are From Early Humans SciTechDailyEnigmatic footprints, once thought to belong to a bear, linked to unknown human ancestor CNNAt least 2 bipedal human species lived nearly 3.7 million years ago NPRTanzania footprints offer clues on origin of human upright walking Yahoo NewsFossil footprints offer new insight into upright walking Bangkok PostView Full Coverage on Google News