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vanishing twins
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Hi, I just heard a news story stating that left handed people were once a twin,and that their twin had died in utero, and been reabsorbed. Has anyone else heard of this?
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The birthrate of twins is on the increase, but is still less than 3% of births.
Lefthandedness is on the increase, from a base persistent rate of around 15% in the general population.
Wiki has an interesting page on left handedness;
http://en.wikipedia.org/wiki/Left-handed
And there is some thought that it might be genetic
http://www.left-handed.com/forum/viewtopic.php ?t=87
Left handedness is up to 3x more common in men than in women, and some researchers have hypothesised that Left handers were exposed to higher rates of testosterone pre birth.
The birthrate of twins is on the increase, but is still less than 3% of births.
Lefthandedness is on the increase, from a base persistent rate of around 15% in the general population.
Wiki has an interesting page on left handedness;
http://en.wikipedia.org/wiki/Left-handed
And there is some thought that it might be genetic
http://www.left-handed.com/forum/viewtopic.php ?t=87
Left handedness is up to 3x more common in men than in women, and some researchers have hypothesised that Left handers were exposed to higher rates of testosterone pre birth.