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posted Jan 2, 2012, 2:06 PM by Maria Clausen   [ updated Jan 2, 2012, 3:30 PM ]
This is a fascinating article in the current issue of National Geographic. And timely for our 10th grade classes!

If you just finished our 10th grade "twins" project, be sure to check out the photo gallery as there is a photo of two identical male twins who mated with two identical female twins. Each couple had a child. See what their children look like!