Although approximately 90% of all humans are right-handed, cats, rats, and mice that show handedness seem to be equally split between right- and left-pawedness.
Medieval Jewish philosopher Maimonides (A.D. 1135-1204) listed 100 blemishes a Jewish priest could not have, and being left-handed was one of them.
In Scotland there is a saying that describes an unlucky person: “He must have been baptized by a left-handed priest.”
The right hand is mentioned positively 100 times in the Bible, while the left hand is mentioned only 25 times, all negatively.
In many Islamic countries, people are forbidden to eat with their left hand, which is considered “unclean” because it is used for cleaning the body after defecation.
Tests conducted by St. Lawrence University in New York found that there were more left-handed people with IQs over 140 than right-handed people.