Left-handed

People who are left-handed are more dextrous with their left hand than with their right hand: they will probably also use their left hand for tasks such as personal care, cooking, and so on. Writing is not as good an indicator of handedness as it might seem, because many people who write with their right hand use their left for everything else.

Left-handedness and health

A 2005 study by researches at the University Medical Center in the Netherlands found that left-handed women were more than twice as likely to develop breast cancer before going through menopause. No reason is known; researchers speculated that it may come about because left-handed women were exposed to higher levels of certain hormones in the womb, which may also explain their handedness.

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