a new species of human ancestors called homo naledi had the brain the size of an orange, stood about five feet tall and incredibly appears to have buried its dead, a behavior previously thought to be really limited to humans. the man who led the team on this amazing find, professor lee berger, joins me from johannesburg, south africa. thank you for being with me, sir. >> good afternoon. >> can you walk us through how significant, how big of a find this is? >> well, every time we find even a small fragment of one of these human relatives, it's a big deal. they are, well, until recently, perhaps the rarest sought after objects on earth. normally our field is fragments. in this discovery, homo naledi, we discovered the largest assemblage of primitive human relatives ever discovered on the continent of africa. 1,500 remains, 15 individuals