Word: walliser
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?By Claudia Wallis. Reported by Mary Cronin/London, Patricia Delaney/Washington and Ruth Mehrtens Galvin/Norfolk
-By Claudia Wallis. Reported by Ruth Mehrtens Galvin/New York
A number of leading fertility researchers warn that until large-scale scientific tests can provide evidence that sex-selection techniques work, consumers had best beware. "With all of today's sophistication about reproduction, the biology of sex selection remains a mystery," observes Elizabeth Whelan, director of the American Council...
New methods of mosquito control are also vital. The challenge is to produce insecticides that are environmentally safe and that can overcome the problem of resistance. Entomologist Brian Federici, a WHO consultant at the University of California, Riverside, may have found a way of solving these two problems by spraying...
-By Claudia Wallis.