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"Identical twins may look alike, but their DNA is not the same as long thought, a new study finds. Moreover, each twin grows more genetically distinct over time. Aside from maybe giving forensic investigators a way to tell which twin committed a crime, these recent findings highlight just how changeable human genomes might really be, twins or not.

Identical, or monozygotic, twins result when a fertilized egg, or zygote, splits in two. Because they derive from the same cell, such twins are generally assumed to be physically identical except for features shaped by environmental factors, such as fingerprints, and by womb conditions."