It even distinguished between identical twins--their genes are the same, but their irises aren't.
The developing embryo starts to split into identical twins within the first two weeks after conception.
And it is only a predisposition towards having non-identical twins that is passed down through families.
Within a pair of identical twins, either both, or neither, will find quinine hard to swallow.
One problem is that separated identical twins do not actually provide a perfect nature-versus-nurture template.
ECONOMIST: WHAT WE LEARN FROM TWINS: The mirror of your soul | The
This is that identical twins may not be as identical as appears at first sight.
Another American scientist, Robert Plomin, has been working with 25, 000 pairs of identical and non-identical twins in Sweden.
ECONOMIST: WHAT WE LEARN FROM TWINS: The mirror of your soul | The
Identical twins Chandra and Leigh Watson have developed a style of sweet, soulful indie-folk that does more than nod to alt-country influences.
The mother of the identical twins, Marcelina Orellana, says Edith is "psychologically ill".
Mr Plomin has also set up a study working with 10, 000 pairs of identical and non-identical twins in Britain.
Laura and Linda Seber, for example, are identical twins from Sheffield Village, Ohio.
Instead, identical twins are epigenetically closer to each other than the fraternal sort.
Mr Bouchard saw an article on a pair of reunited identical twins, and decided to make a study of them.
You always hear about how alike identical twins are, so I wanted to know how Mike was different from his brother.
Once the identical twins reached the age of 50, there was an increased similarity in the number of pairs of individual moles.
This means that behavioural traits with a large genetic component are more likely to be shared by identical twins than fraternal twins.
The researchers looked at how common it was for identical twins to both have Alzheimer's, or for only one to be affected.
Ally and Claudia are identical twins, and their harmonies are incredibly precise.
Rather than looking at the similarities between identical twins, as most of the research tends to do, Epitwin will look at the differences.
Each person's DNA -- the genetic code in a person's cells -- is unique, except in the case of identical twins, he noted.
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Some of it emerged from the first large-scale post-Burt study of separated identical twins, run by Thomas Bouchard, a professor at the University of Minnesota.
Identical twins result when a fertilized egg splits into two embryos.
Moreover, separated identical twins are rarely separated at the moment of birth, and some of them are then reunited before they come under the scientists' eye.
ECONOMIST: WHAT WE LEARN FROM TWINS: The mirror of your soul | The
Although identical twins tend to share whorls, loops and arches in their fingerprints because of their common heredity, the precise patterns of their prints are not the same.
They also looked at the same patterns in non-identical twins.
However, the study, at the hospital's twin research unit, found that identical twins were more likely to have a similar number of moles than twins who are not identical.
For their research, published in the journal Alcoholism: Clinical and Experimental Research, researchers led by Alexis Edwards of Virginia Commonwealth University studied more than 7, 000 fraternal and identical twins.
Dan and Scott Shillum are identical twins, genetic clones produced from the accidental division of a single fertilised egg into two embryos in their mother's womb some 40 years ago.
If Lech wins, however, Jaroslaw would find it difficult to be prime minister, since most Poles are queasy about the idea of identical twins holding the country's two top jobs.
If parents exhibit a tendency to treat identical twins more similarly than fraternal ones, for instance, then what researchers see as genetic factors could turn out to be environmental ones.
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