Many people consider left-handed persons outcasts although some cultures had a positive view of them.
In many cultures the left handers are considered unclean because they used to wipe or wash after defecation.
There are many places around the world where in school children are punished for writing by their left hand.
A lot of famous people including Boston Strangler, Jack the Ripper, and Osama bin Laden were left-handers.
Albert Einstein, Benjamin Franklin, and Alexander the Great were also left-handed persons.