Archaeologists Discover Evidence Of Our Earliest Cave-Dwelling Ancestors A research team has discovered the earliest evidence of our cave-dwelling human ancestors at the Wonderwerk Cave in South Africa. Stone tools found at the bottom level of the cave — believed to be 2 million years old — show that human ancestors were in the cave earlier than ever thought before. Geological evidence indicates that these tools were left in the cave and not washed into the site from the outside world. ... read more