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Attention, chocolate lovers: You may not be able to help yourselves. Swiss and British scientists have linked the widespread love of chocolate to a chemical "signature" that may be programmed into our metabolic systems.
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Rate, infant mortality
Rate, infant mortality: The number of children dying under a year of age divided by the number of live births that year. The infant mortality rate in the United States, which was 12.5 per 1,000 live births in 1980, fell to 9.2 per 1,000 live births in 1990.