Identical twins are uniquely different [The Nation] 09 Feb, 2012
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Identical twins Sienna and Sierra Bernal really are unique - as one is less than half the size of her sister.The 13-year-olds, from Houston, Texas, are the only identical twins in the world in which one is a primordial dwarf. Sienna weighs half as much as Sierra and stands just 4ft tall, compared to
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