Once our ancestors gained the ability to walk upright, suddenly, their hands were free. Free to fist fight, carry things, and most importantly, create tools. The ability to manipulate the environment using external objects isn’t entirely unique to our species, but we’ve taken it much, much further than any other creature. And the fossil record shows us that the evolutionary journey our ancestors took to create the first tools is an incredible one - one that paved the way to the tool-filled world we live in today.