An entire ancient human species, Homo naledi , is known from specimens found at just one site in South Africa, back in 2013. At first, 15 individuals were found inside the Rising Star cave system. Now, archaeologists have specimens of at least 20 of these ancient humans, who lived between 236,000 and 335,000 years ago. A new examination of the ancient proteins preserved in their teeth suggests that the site is surprisingly lacking in males and may even be an all-female site. If that's the case,