[/quote]
It is good to know the Earth can't possibly support an army capable of fighting off all the dead, we know the odds are against us.
Indeed. Although apparently most of the zombies are infants, toddlers, and kids--so if we can devise defenses against very short attackers, maybe the living will prevail.
I was a bit disappointed at the BBC's cutoff: "those who have ever lived" including only Homo Sapiens, so we have no people before 50,000 years ago. I'm hardly an expert on primate evolution, but it seems like we keep pushing back the date for sentient ancestors capable of... well, telling scary stories and counting the number of stars in the sky and wondering about the meaning of it all. That counts for something, I think. Or getting back to our pressing zombie crisis, a zombie Australopithecus could cause just about as much trouble as a Homo Sapiens.