Word: ys
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...carry an X chromosome and some carry a Y. If the former fertilizes an egg, the baby will be a girl; if the latter, a boy. Over the years, fertility gurus have tried to boost production of X- or Y-bearing sperm through diet, or attempted to pick out Ys by their supposedly faster swimming speed or distinct electric charge--with dubious success...
...scientist Lawrence Johnson, who invented the method, they stained sperm with a fluorescent dye that latches onto DNA. Measuring the glow of the sperm cells under laser light, they could gauge how much genetic material each one carried. As it happens, X chromosomes have about 2.8% more DNA than Ys. Once the sperm had been distinguished this way, an automated sorting machine separated the Xs from the Ys, and doctors could perform artificial insemination...
...nearly 30,000 college men and women. And below them lie the foundation of the culture, nearly a million high school players of both sexes (from 16,500 schools) who even now are contesting one another for state titles. And still there are more players in church leagues, the Ys and public playgrounds...
...classroom on Manhattan's Upper West Side are being played out across the country as kiddie exercise becomes the latest boomlet in the ever expanding fitness field. Today pint-size workouts, some for infants as young as six weeks, are offered at many community centers, health clubs and local Ys. Specialized children's exercise centers seem to be springing up everywhere. Playorena, a chain started six years ago, now has 70 centers, mainly on the East Coast, with 7,500 pupils. Gymboree, begun in 1980, boasts 252 franchises nationwide and 50,000 clients. Cost of tot workouts...
...National Y in Washington, the steep annual fees ($473 to $807) paid by 80% of clients finance vans that ferry in members of less posh local branches. In Virginia, the three Tidewater Ys teach all the fifth-graders of Chesapeake to swim. They also have aquatics classes for the physically impaired and aerobics classes for the mentally handicapped. The fitness programs help cover the cost of such services...