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32 scary parasitic diseasesParasites can cause a wide range of diseases in humans, ranging from short-term to lifelong.
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Are cavities 'contagious'? Tooth-decay yeast can pass from moms to babiesA study suggests that a yeast tied to tooth decay in young children may be passed to them by their mothers, and this is more likely if the moms have lots of dental plaque.
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Worldwide, the life-span gap between the sexes is shrinkingAn analysis of mortality data from more than 190 countries suggests the male-female life-span gap is narrowing.
