What do tennis player Goran Ivanisevic and songwriter Paul McCartney<注1> have in common with Fidel Castro? Along with 10 percent of the world's population they are left-handed, according to Lauren Milsom, organizer of Left-Handers Day.“It is well-known that a lot of creative people were left-handed,”Milsom said.“Michelangelo, Leonardo da Vinci, Jimi Hendrix<注2> and Pablo Picasso are all among them.”But Left-Handers Day was not merely a celebration of the creative superiority of lefties. It is also aimed at raising awareness of the difficulties presented by a right-handed world.“It is not a disability, but most things are so tailored to the right hand. A lot of companies are not interested—they say it's a minority market and not commercially viable, but it's a big minority,”Milsom said from her stall, which sells left-handed corkscrews, can-openers and scissors.