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Scots council ‘Twinverclyde’ sees 10 sets of twins prepare to start school
(www.dailyrecord.co.uk)
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Wonder if there's a scientific reason for this
I imagine the Scottish have a few nasty jokes that "explain" this.
There's no explanation I can find after a quick Google. As far as I'm aware, the odds are fixed for identical twins but the chance of having non-identical twins is higher if there are already some in the family and some ethnic groups have a better chance of having them (highest in Nigeria, lowest in Japan). So, if they are non-identical, then it is likely a genetic trait common in the area.
So it's inbreeding