I can't believe CNN would put out such poorly reasoned "science" as fact.
First of all, a ghost is not material. They just appear to walk on floors because that's how they manifest their presentations - they're gliding through space just as much as when they go through walls. I mean, duh.
And vampires turning the whole world to vampires in two years? Yeah, if every victim became a vampire - they don't unless the vampire makes the victim a vampire, which they only do in very special situations to only the coolest victims.
Jeez, don't they vet items before just throwing them on the site?