Disclaimer: No one gets punched in the face in this one. But it is worth noting that left-handers are better fighters, likely because in fights people rarely expect a left hook. Wow, people spend time doing research on fighting? That's a job I need to sign up for.
They said that Western interactive sports such as these can be classed as "special cases of fights - with strict rules, including the "prohibition of killing and intentionally wounding the opponent".
This led them to speculate the same advantage may persist in more aggressive contexts, such as war, so societies which are more violent would have a higher frequency of left-handers.
For the record, Hitler was left-handed.
The article also notes that left-handed people are more likely to have certain diseases. Righties win again!
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