I've been away for Christmas, so I just saw Diannani's post on her Monkey Feet:
and recognized a technological breakthrough that is very popular in my T-Party circles.
These are what we call "Cipherin Shoes" ( AKA "Redneck Calculator") They represent a tremendous leap forward in the technology of my ancestors, in that in cold climates, they allow us to do sums up to twenty without suffering frostbitten toes.
Some of us are lucky enough to be able to do sums up to as much as 28. There had been some confusion at the beginning of the invention of cipherin, as to whether digits were decreed by the gods to be base 10 or base 12, but the 10 fingered were slightly in the majority and so won the argument- the law of unintended consequences has made those polydactyls who survived the discussion (and those who occasionally are born into our population) uniquly able to delve into the realm of "Higher Mathematics" (ie- sums above 20)
Update for Leepin larry: