Being right- or left-handed is a familiar fact about yourself that you likely don't think about much on a day-to-day basis. However, your handedness affects how you interact with the world.
Both left-handedness and breast cancer are affected by sex hormones, and some studies suggested a link. Others, however, did ...
Being left- or right-handed – and the paw, eye, fin and wing equivalents – is a product of genes, development and the environment.
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