Before revision: For example, an international team's discovery of a set of 1.5 million-year-old human ancestor footprints in Ileret, Kenya has shown the earliest direct evidence of a modern human style of upright walking.
After revision: An international team's discovery of a set of 1.5 million-year-old human ancestor footprints in Ileret, Kenya provides the earliest direct evidence of a modern human style of upright walking.