What if it became almost impossible to tell whether someone's voice or image was actually the real deal ?
500 years ago, a deadly epidemic known as 'cocoliztli' killed nearly 80 per cent of the Aztec population.
A strange case of mass hysteria has seen students and even teachers being pinned down by 'evil spirits'.
Villagers in a remote Kazakhstan village are still inexplicably falling asleep for days at a time.
Archaeologists have found evidence of an ancient and devastating epidemic of apocalyptic proportions.
Dozens of people in two remote Russian villages have been falling asleep for up to six days at a time.