The languages reveal the bias.
"There's not a language in the world where this isn't so," said Kushner. Even in English where the word sinister comes from the Latin sinistra, for left and left itself comes from the word ‘lyft' which means broken, Kushner reports.
In German ‘linkisch' is associated with awkwardness. In Russian being called left-handed, or levja is a synonym for being untrustworthy. In Mandarin the character for left can also means weird, wrong, incorrect, different, contrary or opposite, he explains.
But it's not all bad news for lefties. Studies also show that as a population ages, it gets more right-handed. This was taken by some to mean that left-handed people live shorter lives, said Kushner, but it seems more likely that as lefties grow older and more experienced in a right-handed world, they simply get better at using the right hand.
And all that switching of hands could make left-handers' brains more flexible than their right-handed siblings, says psychologist Clare Porac of Penn State University.
"It could be an advantage," Porac told Discovery News. Left-handers have much less trouble using their right hands for tasks than right-handers do using their lefts, she said, because lefties are forced to learn to work opposite handed. This has implications for what parts of the brain are being used for every task, she explained.
In China, there are even signs that lefties are being cut some slack, said Kushner. In recent years left-handed Chinese ping pong players have been widely recognized as superior to others, providing at least one very visible positive role for lefties.