Left-handed people have a shorter life expectancy than right-handed people, by about two years. This relationship is very robust, having been demonstrated in dozens of longitudinal studies. The usual explanation is that it's just a little more dangerous and stressful for lefties, because they live in a world made for right-handed people. So they die earlier.Imagine that a researcher identifies a gene that both increases the likelihood of a person being left-handed AND the susceptibility of a person to certain diseases of aging (e.g., heart disease, hypertension, diabetes).In this case, we would say that the link between hair color and handedness is:-Misanthropic-Post-modern-Spurious-Causal

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