A new study from the University of Washington Health Sciences claim that over 25 percent of left handed people have a slender lower face. The research was conducted with 13, 536 individuals in three national surveys in the United States.

Science Daily reported that the findings may shed a light on the origins of left-handedness. For one thing, people with slender jaws are also related to tuberculosis (TB). For those who do not know, TB has shaped human evolution and still affects 2 billion people today.

Published in the journal "Laterality: Asymmetries of body, Brain and Cognition", the University of Washington research proves the theory of a Greek physician roughly 2,000 years ago. The expert first identified slender jaws as a marker of TB susceptibility. Philippe Hujoel, the author, said that the low body weight of this slim physique is still recognized by the Centers for Disease Control and Prevention as a sign of the ailment. Hujoel, to be specific, teaches at the University's School of Dentistry and the School of Public Health.

Per Daily Mail, this research raises the hypothesis that genetics shaping facial features and TB susceptibility "increase the likelihood for left-handedness." Such intelligent guesses could later explain the curious "geographical coincidences". In fact, the Unite Kingdom has a high prevalence of left-handedness and people there have slender faces.

On the other hand, the Eskimos were descried as TB-resistant people and thy have robust facial features. Also, they are depicted in art as right-handed. They have been illustrated making tools and instruments using the said hand.

Lastly, in the early 20^th century, slender persons were dubbed as ectomorphs". It is also used to describe people indulged in dieting and bodybuilding. In a world dominated by right-handers, obesity (which also has high percentage among people), might be connected. Well, further tests are needed but the research is already providing significant discoveries.