Many embryonic twins 'vanish' in pregnancy

Published: Thursday, April 26 2007 12:09 a.m. MDT

Question: "Vanishing Twin Syndrome" (VTS) refers to:

A. the tendency for twins to move apart and lose contact

B. one twin dying long before the other

C. poor birth records showing far fewer twins born than actually are

D. many embryonic twins disappearing long before being born, often without leaving a trace
.

Answer: Amazingly D, with as many as 1 in 8 pregnancies beginning as twin conceptions though only 1 in every 80 live births results in twins, says Scott Forbes in "A Natural History of Families." Most twin gestations undergo "brood reduction," which occurs early and out of sight, before the embryos technically become fetuses at 8 weeks. Some but not all vanishing twins can be detected with ultrasound, and in fact, it wasn't until the use of early sonograms in the 1980s that the scope of VTS became apparent.

What happens is that one twin spontaneously aborts, usually during the first trimester, with the fetal tissue absorbed by the other twin, the placenta, or the mother, says Pamela Prindle Fierro in "Your Guide to Parenting of Multiples." So when Mom-to-be comes back for a second exam 6 weeks later, only one heartbeat is now heard via Doppler scan. A follow-up ultrasound confirms only one fetus. Generally when VTS occurs early, neither Mom nor the remaining fetus requires medical treatment, and the singleton experiences a normal delivery.

Question: For this, the Spaniards say "patata" (potato), the Danes "appelsin" (orange), the Swedes "omelett," the Finns "maikku" (a kind of fish), the Koreans "kim chi" (cabbage), the Poles "dzem" (marmalade), and the Chinese "qiezi" or "ch'ieh tzu" (eggplant). Some Australian households have begun to use the word "money," the Japanese use the English word "whisky," the Czechs used to say "syr" (cheese) but lately have opted for "fax," better befitting their modern republic. What do most speakers of English say and what's the point of all these utterings anyway?

Answer: They say "say cheese," of course, a photography practice that originated in British public schools circa 1910. All the above are used to tease the mouth into a fetching facsimile of a smile, for those subjects a bit camera-shy, says Angus Trumble in "A Brief History of the Smile." Malays and some other Muslims, Gypsies, North American Indians and certain tribes of Aboriginal Australians have traditionally avoided having their photos taken, so they say nothing at all.

Question: What's one Scrabble-bot's new trick to make human opponents even easier to beat?

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