Alberto Monteiro wrote:
Julia Thompson wrote:
I came across the following statistic just now:
18% to 22% of twins are left-handed
fewer than 10% of non-twins are left-handed
I'm wondering why that would be, now.
Maybe because they are mirror images of the sibling :-)
That's only for monozygotic twins, and not very many monozygotic twins
are mirror twins. (I've only known 2 pair of mirror twins out of all
the monozygotic twins I've met....)
But then that raises the question -- what were the handedness of Good
Spock and Evil Spock? :)
BTW, the incidence of twins in the US has been increasing, but the
incidence of monozygotic twins has not. At least, certainly not at the
same rate.
Julia
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