Given the costs of awkwardness, we can expect the trait to disappear with the evolution of humans, but there is an interesting explanation.
According to the "fighting hypothesis", right-handers are more accustomed to fighting than right-handed ones because of the relative scarcity of left-handers.
As a result, left-handers, also known as Southpaws, have a competitive advantage in combat because their opponents may be disoriented by their fighting position.
During more violent periods of human history, this meant that left-handers would have been dominant in the physical confrontation and therefore more able to propagate their genes, explained researcher Thomas Richardson, biologist of evolution and PhD student at the University of Manchester, UK.
"The reason leftists exist is because our left-handed ancestors have won more fights," said Richardson, himself left-handed, by phone.
And his research provides new evidence for the battle hypothesis.
After analyzing the performance of nearly 10,000 boxers and martial arts fighters, Richardson found that left-handers are overrepresented among fighters and that they also win a higher percentage of fights.
He also used a scoring system that takes into account the quality of the opponent and other metrics to provide a more complete picture.
The results show that a randomly selected southpaw fighter would have a higher odds than a right handed fighter randomly selected 54% of the time.
"It's a minor but important effect," said Richardson, who studies competition and violence between men.
The results build on previous research that left-handers have an advantage in combat sports.
However, this article uses a much larger and more diverse dataset, according to Richardson.
Even if you are not one to fight, the good news is that this competitive advantage extends to other sports where face-to-face interactions are direct, like tennis.