The symbols "+" and "-" first appeared in an unpublished manuscript by German mathematician Regiomontanus in 1456. Their first appearance in print was in a mercantile handbook by Johannes Widmann, printed in Leipzig in 1489.
From the Morning Chronicle, 26 March 1811
A blacksmith at Stroud ate on Tuesday, for a trifling wager, a pint of periwinkles with the shells, in the space of ten minutes. Being desired to repeat this disgusting feat he readily did it, but he is now so dangerously ill that he is not expected to recover.
Georgina, Duchess of Devonshire (1757 – 1806) was a keen gambler. When she died, it is said she owed more than £3 million in today’s money.