I frequently hear that left-handed people tend to be smarter, or more creative, etc. For example, a disproportionate number of musicians, presidents, and doctors are left-handed. Does being left-handed give you these traits or is it a correlation due to another factor? If true, why?
Removed "etc" as being too open, making it hard to falsify. Removed (probably impossible!) demand for causation from the title to simplify.
Oddthinking
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