Get some sage at the ready, because today marks the ominous Friday 13th. The day has long been marked as a particularly unlucky one for hundreds of years, but the precise origin of the superstition remains unclear.
The 13 part of it is not confined to the Friday 13 superstition. Skyscrapers will often eschew a 13th floor, opting to jump from 12 to 14, while airlines will also often skip row 13 on passenger jets.
But what about the Friday part? One possible explanation is the Last Supper, where Jesus sat down with 12 disciples meaning that there were 13 diners, before he was crucified on Good Friday.
