"1470" itself has to do with the skull (KNM-ER 1470) found in 1972 in Africa. It was believed to be a bridge between two already "known" steps in the development of modern humans. I understand that eventually it had been determined not to be part of that line. At the time this song was written I think (but might be remembering wrong) that KNM-ER 1470 was still being argued as a possible bridge, but more and more experts were coming to believe it was a different species.
"1470" itself has to do with the skull (KNM-ER 1470) found in 1972 in Africa. It was believed to be a bridge between two already "known" steps in the development of modern humans. I understand that eventually it had been determined not to be part of that line. At the time this song was written I think (but might be remembering wrong) that KNM-ER 1470 was still being argued as a possible bridge, but more and more experts were coming to believe it was a different species.