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The Human Development Index (HDI) is a summary measure of average achievement in key dimensions of human development: a long and healthy life, being knowledgeable and have a decent standard of living. The HDI is the geometric mean of normalized indices for each of the three dimensions.
Huntington's disease (HD) is a hereditary and progressive brain disorder. You can't catch it from another person. Although symptoms may first show up in midlife, Huntington's can strike anyone from childhood to advanced age. Over 10 to 25 years, the disease gradually kills nerve cells in the brain.