High up in the Himalayan mountains of the Uttarakhand state of India, lies a small glacial lake called Roopkund. At an altitude of 16,499 feet, it is frozen over most of the year. But when the ice melts occasionally, Roopkund gives up its grisly secret.
Plaque on the teeth of a 1,000-year-old skeleton has been found and it contains biological material. Containing a high concentration of genetic material and numerous pathogens, this is the oldest biological material yet recovered.
Archaeologists say they have found two medieval remains of the dead pinned down to their graves through the chests with iron rods, a practice widely used in Europe up until the first decade of the 20th century to stop the dead from becoming vampires.