this reminds me of a joke...
scientists around the world were trying to figure out which was the most advanced in the past
so, the french dig a deep hole and found some copper string, and claimed that they had invented the telephone 1000 years ago
the english dug an even deeper hole and found some glass shards, and claimed that they had invented fiberglass wires 2000 years ago
the portuguese dug an absurdly deep hole, and found NOTHING
so they claimed that they invented wireless cellphone 6000 years ago