Fact 1: 1 in 250 pregnancies result in identical twins. (We are not identical but look a lot a like for being fraternal twins)
Fact 2: 22% of twins are left-handed (compared to 10% for single babies). (No left handed twins here!)
Fact 3: Identical twins share the same DNA but have different fingerprints.
Fact 4: The average twin pregnancy lasts only 37 weeks, while the average single pregnancy lasts 40 weeks.
Fact 5: Scientists believe that there may be a genetic linkage to having fraternal twins, not identical, but only on the mother’s side. ( Defiantly linkage in our family. There are two other set of fraternal twins besides us on my Mom’s side)
Here we are with the parents!
Fact 6: Because identical twins developed from the same split egg and were fertilized by the same sperm, they share exact matches of their DNA.
Fact 7: If the mother herself is a fraternal twin, she is five times more likely to have twins. (Oh dear, this makes me nervous)
Fact 8: Twins have been known to develop their own dialect, or language. This is known as “cryptophasia”, and only they can understand what is being said. (My sister and I had this language!)
Fact 9: The term “twin” derives from the ancient German word “twine” meaning “two together”.
Fact 10: There’s no hereditary trait that influences a predisposition to having identical twins. Identical twins do not run in families. Although there are families with a high incidence of identical twins, it is due to chance, coincidence or plain good luck.
Some strange facts!
1. Mothers of twins live longer
Twins have been greeted as everything from an unwanted burden to “a sign of their father’s superior virility,” says The Economist. But a new study from the University of Utah shows that twins “have more to do with their mother’s sturdy constitution than their father’s sexual power.” Looking at the birth records for 59,000 women between 1800 and 1970, researchers found that women who give birth to twins live longer, have healthier kids, and “appear to be healthier” themselves, says lead author Ken R. Smith. That’s probably because sturdier women have twins, not because having twins is good for you, the study notes.
2. But they get divorced more often
It seems that twins can help unravel a marriage, say Dr. Anupam Jena and his colleagues at Boston’s Massachusetts General Hospital. When a couple’s only children are twins, parents are only about 1 percent more likely to get divorced than parents of singletons. But add in more kids (or less income), and the risk of divorce shoots up. The reason is probably the added stress, both financial and emotional.
3. Twin fetuses start playing at 14 weeks
Examining 3D ultrasound images of five pairs of in-utero twins, a team at the University of Padova, Italy, found that fetuses started deliberately interacting at 14 weeks, reaching out and touching each other through the uterine wall. By 18 weeks, they spent more time stroking each other than themselves, and were equally careful when touching their co-twin’s sensitive eye areas. The results are “astonishing,” says Jean-Philippe Rivière at Doctissimo. At 14 weeks, “they were already socializing with their sibling in the womb.”
4. If you separate identical twins, they still end up similar
Surveying decades of twin research, George Mason University economist Bryan Caplan found the “most prominent conclusion” to be that “practically everything — health, intelligence, happiness, success, personality, values, interests — is partly genetic.” We may latch on to the parenting-centric ideas of “Tiger Mom” Amy Chua, says Helen Rumbelow in The Australian. But the dozens of rigorous studies on separated-at-birth twins is much more persuasive than “Chua’s sample of one”: As adults, even separated twins are “very similar on almost every count.”
5. But identical twins can get sick very differently
In 1983, two identical twin infant boys were given a blood transfusion contaminated by HIV; decades later, one has an almost-normal immune system while the other is faring much worse. Brigham Young University researchers recently tried to explain the different reactions. What they found, says Amanda Carpenter at Virology, is that once identical twins leave the womb and are “exposed to different pathogens, bacteria, and microbes,” their immune systems are not identical at all.
Who knew being a twin was so much fun and different! I did!