<p>Human ancestors may have used the tools to hunt large game in present-day South Africa.</p> <p>The post <a href="https://www.popsci.com/science/archaeologists-hike-up-a-cliff-and-find-20000-year-old-stone-tools/">Archaeologists hike up a cliff and find 20,000-year-old stone tools</a> appeared first on <a href="https://www.popsci.com">Popular Science</a>.</p>