The ancestor who made the 3.7 million-year-old prints walked in a "less ape-ish way" than some humans do today. The oldest known human ancestor footprints, dated to 3.7 million years ago, reveal that some of the earliest members of our family tree walked fully upright with feet similar to ours, according to new research. The findings, published in the Journal of the Royal Society Interface, push back the date for upright walking in our ancestry by nearly 2 million years. That's because previous studies had concluded this trademark gait emerged in the genus Homo about 1.9 million years ago. The...