Scientists just found a tiny bump on a 7-million-year-old ape’s leg bone that screams: this guy walked on two legs! Only humans and our ancestors have this bump, so Sahelanthropus tchadensis might be our oldest known relative. The fossil’s hips and knees are super human-like, but its arms are all about tree climbing. Basically, this ancient ape could be the missing link in our family tree—or just a bipedal weirdo. Either way, evolution just got way juicier! #History #HumanEvolution #FossilFind