we, the human animal, came from. >> dion: here there's a classic little sinkhole. there's loads of these. this is what this area is. i mean, the cradle, this is called the cradle, it's in our world heritage site 'cause 60% of all the evidence for human evolution comes out of this valley. it's from caves like this that keep the record. the geology just conspires to preserve fossils. they're very, very rare things, hominid fossils, but they've found more here in the last ten years than they're sort of found anywhere. so you're home. this is where you started. >> anthony: this is my ancestral homeland? >> dion: this is your ancestral homeland. >> anthony: oh, that sound makes me happy. what does that sound remind you of, guys? what does that evoke for you, that sound? primeval? you know, happy childhoods at