This was a very long, very interesting article. I learned a bit from it. Two of my uncles are fraternal twins involved in a long-term twin study. They just tra

This was a very long, very interesting article. I learned a bit from it. Two of my uncles are fraternal twins involved in a long-term twin study. They just traveled to the east coast for their periodic study updates a month or two ago. I don't know what may have been learned from tracking them through the years but I know they have enjoyed the opportunity to participate. Handedness mentioned in the article was also interesting since I have siblings who are left-handed and my son and I are ambidextrous in many things. I worked with a man who could close his eyes and write his name in cursive with each hand simultaneously with the left hand signature being a mirror image of the right hand signature. Pretty spectacular. Other odd things mentioned included tendencies for moles or acne to appear in the same relative places on twins suggest to me that mole positions on singletons could also be passed from a parent such that a child having a mole in the same place as one of the parents could be an inherited trait - the "family" mole or birthmark. Genetics is weird and fascinating and I haven't looked closely enough at it to understand it. I may have to read some more on the subject. Thanks for this article.